I develop (in my free time, which is not so much), the project / question tracker in zotonic. The code can be found here: https://github.com/kaos/trackz and a demo site with the code here: http://trackz.astekk.se/
This is in the early stages, so it will not be too difficult to monitor progress from scratch, looking at the commits made, there is still not much to watch.
It is designed against 0.8.x, so there will probably be no problems running on 0.9-dev.
I also have some articles about zotonic internals (how to write modules for zotonic) and other related topics here: http://blog.astekk.se/en/by_keyword/318/zotonic
Hope this fills at least some of your questions :)
Hint:
Explore the data model and directory structure. As soon as you feel it, everything else will be easy.
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