diff --git a/README.md b/README.md
index 0b43285..1ba045a 100644
--- a/README.md
+++ b/README.md
@@ -3,40 +3,40 @@
 [Alpine Linux documentation](https://docs.alpinelinux.org/user-handbook/0.1a/Installing/setup_alpine.html) assumes one can interract with system directly with a keyboard & display.\
 However, there are many cases where one might want to deploy a headless system, only available through a network connection (ethernet, wifi or as USB ethernet gadget).
 
-This repo provides an overaly file to initially boot the headless system (leveraging Alpine distro's `initramfs` feature): it enables a basic ssh server to log-into from another Computer, in order to finalize system set-up.
+This repo provides an **overlay file** to initially boot the headless system (leveraging Alpine distro's `initramfs` feature): it enables a basic ssh server to log-into from another Computer, in order to finalize system set-up.
 
 
 ## Install procedure:
 Please follow [Alpine Linux Wiki](https://wiki.alpinelinux.org/wiki/Installation#Installation_Overview) to download & create installation media for the chosen platform.\
 Tools provided here can be used on any plaform for any install modes (diskless, data disk, system disk).
 
-Just add [**headless.apkovl.tar.gz**](https://github.com/macmpi/alpine-linux-headless-bootstrap/raw/main/headless.apkovl.tar.gz) overlay file at the root of Alpine Linux boot media (or onto any writeable side-media) and boot the system.
+Just add [**headless.apkovl.tar.gz**](https://github.com/macmpi/alpine-linux-headless-bootstrap/raw/main/headless.apkovl.tar.gz) overlay file at the root of Alpine Linux boot media (or onto any custom side-media) and boot the system.
 
-With default network interface definitions (and optional wifi SSID/pass file), one may then access the system under `ssh` with:\
+With default network interface definitions (and SSID/pass file if using wifi), one may then access the system under `ssh` with:\
 `ssh root@<IP>`  (system IP address may be determined with any IP scanning tools such as `nmap`).
 
 As with Alpine Linux initial bring-up, `root` account has no password initially (change that after setup!).\
 From there, system install can be fine-tuned as usual with `setup-alpine` for instance (check [wiki](https://wiki.alpinelinux.org/wiki/Alpine_setup_scripts#setup-alpine) for details).
 
 
-Optional files can be added next to `headless.apkovl.tar.gz` to customise setup (sample files are provided):
-- `wpa_supplicant.conf`: define wifi SSID & password (mandatory for wifi usecase).
-- `interfaces`: define network interfaces at will, if defaults DCHP-based are not suitable.
-- `unattended.sh`: make custom automated deployment script to further tune & extend setup (backgrounded).
+Add-on files may be added next to `headless.apkovl.tar.gz` to customise setup (sample files are provided):
+- `wpa_supplicant.conf` (*mandatory for wifi usecase*): define wifi SSID & password.
+- `interfaces` (*optional*): define network interfaces at will, if defaults DCHP-based are not suitable.
+- `unattended.sh` (*optional*): make custom automated deployment script to further tune & extend setup (backgrounded).
 
 *Note:* these files are linux text files: Windows/macOS users need to use text editors supporting linux text line-ending (such as [notepad++](https://notepad-plus-plus.org/), BBEdit or any other).
 
+**Goody:** seamless USB bootstrapping for PiZero devices (or similar which can support USB ethernet gadget networking):\
+Just add `dtoverlay=dwc2` in `usercfg.txt` (or `config.txt`), and plug-in USB to Computer port.\
+With Computer set-up to share networking with USB interface as 10.42.0.1 gateway, one can log into device from Computer with `ssh root@10.42.0.2` !...
+
 Main execution steps are logged in `/var/log/messages`.
 
 
 ## How to customize further ?
 This repository may be forked/cloned/downloaded.\
 Main script file is [`headless.start`](https://github.com/macmpi/alpine-linux-headless-bootstrap/blob/main/overlay/etc/local.d/headless.start).\
-Execute `./make.sh` to rebuild `headless.apkovl.tar.gz`.
-
-*Side note:* one nicety for bootstrapping PiZero devices, or similar which can support USB ethernet gadget networking.\
-Just add `dtoverlay=dwc2` in `usercfg.txt` (or `config.txt`), and plug-in USB to Computer port.\
-With Computer set-up to share networking with USB interface, device will appear at 10.42.0.2 onto Computer's subnet to log into !...
+Execute `./make.sh` to rebuild `headless.apkovl.tar.gz` after changes.
 
 
 ## Credits
diff --git a/headless.apkovl.tar.gz b/headless.apkovl.tar.gz
index 4cb13a6..bde0716 100644
Binary files a/headless.apkovl.tar.gz and b/headless.apkovl.tar.gz differ
diff --git a/make.sh b/make.sh
index 1db0cc9..53963d4 100755
--- a/make.sh
+++ b/make.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
 
+chmod 600 overlay/etc/ssh/ssh_host_*_key
 chmod +x overlay/etc/local.d/headless.start
 tar czvf headless.apkovl.tar.gz -C overlay etc --owner=0 --group=0
diff --git a/overlay/etc/local.d/headless.start b/overlay/etc/local.d/headless.start
index 5051436..80ec46e 100755
--- a/overlay/etc/local.d/headless.start
+++ b/overlay/etc/local.d/headless.start
@@ -1,8 +1,12 @@
 #!/bin/sh
 
+VERSION="0.5"
+
 # Redirect stdout and errors to console as rc.local does not log anything
 exec 1>/dev/console 2>&1
 
+logger -st ${0##*/} "Alpine Linux headless bootstrap v$VERSION by macmpi"
+
 mkdir /tmp/.trash
 ovlpath=$( find /media -type d -path '*/.*' -prune -o -type f -name *.apkovl.tar.gz -exec dirname {} \; | head -1 )
 
@@ -12,7 +16,6 @@ if [ -f "${ovlpath}/wpa_supplicant.conf" ]; then
 	logger -st ${0##*/} "Wifi setup found !"
 	apk add wpa_supplicant
 	cp "${ovlpath}/wpa_supplicant.conf" /etc/wpa_supplicant/wpa_supplicant.conf
-	rc-service wpa_supplicant start
 else
 	logger -st ${0##*/} "Wifi setup not found !"
 fi
@@ -68,6 +71,8 @@ cat /etc/network/interfaces
 
 echo "alpine-headless" > /etc/hostname
 hostname -F /etc/hostname
+
+grep -q "wlan" /etc/network/interfaces && [ -f /etc/wpa_supplicant/wpa_supplicant.conf ] && rc-service wpa_supplicant start
 rc-service networking start
 
 
@@ -84,8 +89,6 @@ cat <<-EOF >> /etc/ssh/sshd_config
 	AuthenticationMethods none
 	PermitEmptyPasswords yes
 	PermitRootLogin yes
-	HostKey /tmp/.trash/ssh_host_dsa_key
-	HostKey /tmp/.trash/ssh_host_ecdsa_key
 	HostKey /tmp/.trash/ssh_host_ed25519_key
 	HostKey /tmp/.trash/ssh_host_rsa_key
 	EOF
diff --git a/overlay/etc/ssh/ssh_host_dsa_key b/overlay/etc/ssh/ssh_host_dsa_key
deleted file mode 100644
index dfc83c8..0000000
--- a/overlay/etc/ssh/ssh_host_dsa_key
+++ /dev/null
@@ -1,21 +0,0 @@
------BEGIN OPENSSH PRIVATE KEY-----
-b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAABsQAAAAdzc2gtZH
-NzAAAAgQDHKXTtPOsM86zrYXbYx4JpmRlxIipjm1H2ce8YyTWJj3es/rjMXN3bB3LOuXWB
-20XzwU8Z/cIOyhzWixsucU60bmiP7y+lR1m9bqYD+GftcmJJD4A5kpz1laivGqRNhpfYrN
-TAe7+jGNi7xh80O91L3ScCQArZJdhhNAa9HosV/QAAABUAlZem7iptLcndvpXz3Gj1MXYY
-bN0AAACASzMGzrARwRQB1KPxjrwVXVoPi5QGH3bnziaWMiKXxVu2br5lkqu57unXUHX1ec
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-AAAADnJvb3RAbG9jYWxob3N0AQIDBAU=
------END OPENSSH PRIVATE KEY-----
diff --git a/overlay/etc/ssh/ssh_host_dsa_key.pub b/overlay/etc/ssh/ssh_host_dsa_key.pub
deleted file mode 100644
index c06d183..0000000
--- a/overlay/etc/ssh/ssh_host_dsa_key.pub
+++ /dev/null
@@ -1 +0,0 @@
-ssh-dss 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 root@localhost
diff --git a/overlay/etc/ssh/ssh_host_ecdsa_key b/overlay/etc/ssh/ssh_host_ecdsa_key
deleted file mode 100644
index 46075c8..0000000
--- a/overlay/etc/ssh/ssh_host_ecdsa_key
+++ /dev/null
@@ -1,9 +0,0 @@
------BEGIN OPENSSH PRIVATE KEY-----
-b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAaAAAABNlY2RzYS
-1zaGEyLW5pc3RwMjU2AAAACG5pc3RwMjU2AAAAQQQAo6TcIAgnFGCX0HJbqFtwEa/H+NQ1
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-cluoW3ARr8f41DWBCll/36AolxYI0gaQZ1KB6sRFurHdqeMQMq/DOU+vBJpoXSAxJGD/bJ
-8AAAAhAJ2Ka8kkJQcRGROSTPW+PBY6hM8K3CUhZsN34HMHVXxTAAAADnJvb3RAbG9jYWxo
-b3N0AQ==
------END OPENSSH PRIVATE KEY-----
diff --git a/overlay/etc/ssh/ssh_host_ecdsa_key.pub b/overlay/etc/ssh/ssh_host_ecdsa_key.pub
deleted file mode 100644
index a378fe2..0000000
--- a/overlay/etc/ssh/ssh_host_ecdsa_key.pub
+++ /dev/null
@@ -1 +0,0 @@
-ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBACjpNwgCCcUYJfQcluoW3ARr8f41DWBCll/36AolxYI0gaQZ1KB6sRFurHdqeMQMq/DOU+vBJpoXSAxJGD/bJ8= root@localhost
diff --git a/overlay/etc/ssh/ssh_host_ed25519_key b/overlay/etc/ssh/ssh_host_ed25519_key
index c459d37..a822907 100644
--- a/overlay/etc/ssh/ssh_host_ed25519_key
+++ b/overlay/etc/ssh/ssh_host_ed25519_key
@@ -1,7 +1,7 @@
 -----BEGIN OPENSSH PRIVATE KEY-----
 b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
-QyNTUxOQAAACCF1PEIbFPSWF5xRx3uqY+AcSgwKn3t8S/jLV3unTJWLgAAAJjeHXU03h11
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+zPpisCsPFtF0z5CiD5x4AAAAFHJvb3RAYWxwaW5lLWhlYWRsZXNzAQ==
 -----END OPENSSH PRIVATE KEY-----
diff --git a/overlay/etc/ssh/ssh_host_ed25519_key.pub b/overlay/etc/ssh/ssh_host_ed25519_key.pub
index ef5bfb0..0eaca89 100644
--- a/overlay/etc/ssh/ssh_host_ed25519_key.pub
+++ b/overlay/etc/ssh/ssh_host_ed25519_key.pub
@@ -1 +1 @@
-ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIXU8QhsU9JYXnFHHe6pj4BxKDAqfe3xL+MtXe6dMlYu root@localhost
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFDkOG8bPwDdg9UfbXxEJh2+zPpisCsPFtF0z5CiD5x4 root@alpine-headless
diff --git a/overlay/etc/ssh/ssh_host_rsa_key b/overlay/etc/ssh/ssh_host_rsa_key
index 7b6624a..986606b 100644
--- a/overlay/etc/ssh/ssh_host_rsa_key
+++ b/overlay/etc/ssh/ssh_host_rsa_key
@@ -1,38 +1,38 @@
 -----BEGIN OPENSSH PRIVATE KEY-----
 b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAABlwAAAAdzc2gtcn
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+GNh6ZEwDEBsLDmULXy1sZb/Qwa/fzZjzZI1Brg7Uv0QgeYfZ7DJX2+vljDDp+3gfSZAAAA
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+nFl79+yNA/YhoIU5AvsdQOL6R7H8eX5d/J5TNYHaTObbfwLT2A8kZbQqJMEAAdzd6iANxp
+/NAYAL2MrrAklvyy++ZvzGFNRwHNcAAADBAMMCaORukaRnli5pr/bl4F5Gg91GzoW8Xj/3
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+QyEJQn6f3J/QAAABRyb290QGFscGluZS1oZWFkbGVzcw==
 -----END OPENSSH PRIVATE KEY-----
diff --git a/overlay/etc/ssh/ssh_host_rsa_key.pub b/overlay/etc/ssh/ssh_host_rsa_key.pub
index 1b0d9d7..248e2d9 100644
--- a/overlay/etc/ssh/ssh_host_rsa_key.pub
+++ b/overlay/etc/ssh/ssh_host_rsa_key.pub
@@ -1 +1 @@
-ssh-rsa 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 root@localhost
+ssh-rsa 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 root@alpine-headless