diff --git a/.gitignore b/.gitignore
index a728c6e..7f1f834 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
 /output
 /external_tree/customizations/users.table
-/external_tree/customizations/overlay
diff --git a/external_tree/customizations/overlay/etc/modules.load.d/50-i2c-dev.conf b/external_tree/customizations/overlay/etc/modules.load.d/50-i2c-dev.conf
new file mode 100644
index 0000000..208f61d
--- /dev/null
+++ b/external_tree/customizations/overlay/etc/modules.load.d/50-i2c-dev.conf
@@ -0,0 +1,2 @@
+# Load i2c-dev at boot.
+i2c-dev
diff --git a/external_tree/customizations/overlay/etc/sudoers b/external_tree/customizations/overlay/etc/sudoers
new file mode 100644
index 0000000..f4a262a
--- /dev/null
+++ b/external_tree/customizations/overlay/etc/sudoers
@@ -0,0 +1,97 @@
+## sudoers file.
+##
+## This file MUST be edited with the 'visudo' command as root.
+## Failure to use 'visudo' may result in syntax or file permission errors
+## that prevent sudo from running.
+##
+## See the sudoers man page for the details on how to write a sudoers file.
+##
+
+##
+## Host alias specification
+##
+## Groups of machines. These may include host names (optionally with wildcards),
+## IP addresses, network numbers or netgroups.
+# Host_Alias	WEBSERVERS = www1, www2, www3
+
+##
+## User alias specification
+##
+## Groups of users.  These may consist of user names, uids, Unix groups,
+## or netgroups.
+# User_Alias	ADMINS = millert, dowdy, mikef
+
+##
+## Cmnd alias specification
+##
+## Groups of commands.  Often used to group related commands together.
+# Cmnd_Alias	PROCESSES = /usr/bin/nice, /bin/kill, /usr/bin/renice, \
+# 			    /usr/bin/pkill, /usr/bin/top
+# Cmnd_Alias	REBOOT = /sbin/halt, /sbin/reboot, /sbin/poweroff
+
+##
+## Defaults specification
+##
+## You may wish to keep some of the following environment variables
+## when running commands via sudo.
+##
+## Locale settings
+# Defaults env_keep += "LANG LANGUAGE LINGUAS LC_* _XKB_CHARSET"
+##
+## Run X applications through sudo; HOME is used to find the
+## .Xauthority file.  Note that other programs use HOME to find   
+## configuration files and this may lead to privilege escalation!
+# Defaults env_keep += "HOME"
+##
+## X11 resource path settings
+# Defaults env_keep += "XAPPLRESDIR XFILESEARCHPATH XUSERFILESEARCHPATH"
+##
+## Desktop path settings
+# Defaults env_keep += "QTDIR KDEDIR"
+##
+## Allow sudo-run commands to inherit the callers' ConsoleKit session
+# Defaults env_keep += "XDG_SESSION_COOKIE"
+##
+## Uncomment to enable special input methods.  Care should be taken as
+## this may allow users to subvert the command being run via sudo.
+# Defaults env_keep += "XMODIFIERS GTK_IM_MODULE QT_IM_MODULE QT_IM_SWITCHER"
+##
+## Uncomment to use a hard-coded PATH instead of the user's to find commands
+# Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+##
+## Uncomment to send mail if the user does not enter the correct password.
+# Defaults mail_badpass
+##
+## Uncomment to enable logging of a command's output, except for
+## sudoreplay and reboot.  Use sudoreplay to play back logged sessions.
+# Defaults log_output
+# Defaults!/usr/bin/sudoreplay !log_output
+# Defaults!/usr/local/bin/sudoreplay !log_output
+# Defaults!REBOOT !log_output
+
+##
+## Runas alias specification
+##
+
+##
+## User privilege specification
+##
+root ALL=(ALL) ALL
+
+## Uncomment to allow members of group wheel to execute any command
+# %wheel ALL=(ALL) ALL
+
+## Same thing without a password
+%wheel ALL=(ALL) NOPASSWD: ALL
+
+## Uncomment to allow members of group sudo to execute any command
+# %sudo	ALL=(ALL) ALL
+
+## Uncomment to allow any user to run sudo if they know the password
+## of the user they are running the command as (root by default).
+# Defaults targetpw  # Ask for the password of the target user
+# ALL ALL=(ALL) ALL  # WARNING: only use this together with 'Defaults targetpw'
+
+## Read drop-in files from /etc/sudoers.d
+## (the '#' here does not indicate a comment)
+#includedir /etc/sudoers.d
diff --git a/external_tree/customizations/overlay/etc/systemd/timesyncd.conf b/external_tree/customizations/overlay/etc/systemd/timesyncd.conf
new file mode 100644
index 0000000..19fa7da
--- /dev/null
+++ b/external_tree/customizations/overlay/etc/systemd/timesyncd.conf
@@ -0,0 +1,20 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+# Entries in this file show the compile time defaults.
+# You can change settings by editing this file.
+# Defaults can be restored by simply deleting this file.
+#
+# See timesyncd.conf(5) for details.
+
+[Time]
+NTP=0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org
+#FallbackNTP=time1.google.com time2.google.com time3.google.com time4.google.com
+#RootDistanceMaxSec=5
+#PollIntervalMinSec=32
+#PollIntervalMaxSec=2048
+