Why do you prefer your own image instead of build/configuration service?
I think it would be great feature to setup ansible and then just launch it to config and run all services.
There are many same tools, but ansible is written on pythone which is in all linux distrubs.
Also ansible very lightweight (about 700k).
http://docs.ansible.com/index.html
Also ansible have many modules for each configuration task
http://docs.ansible.com/modules_by_category.html
With this tool you can easy to make just one soft config for all platforms and all distrubs.
I like your project but preferred raspbian with my own config.
I got many features from your releases

Thx for your work.