Well, I've read this evening the post (not entirely!:) , but I have to say the idea is GREAT.
I have been playing Fs2 a lot, and really love the idea of extending its usability ad libitum (I really hated to give up X-Wing and Tie Fighter...), but let me offer you just a little suggestion:
I am into the Linux community since 1996, and I have seen zillions projects born and disappear, and the most sad ones where the one "died in the middle", not too early, not enough late to allow use...
This is a HUGE project, as everybody understands, so perhaps just start with something that might involve a lot of people at beginning (the already proposed "demos that work"), and do call in the Linux people who are absolutely longing for games like Fs2!
They would provide *great* advice on what to do/don't and how to limit our dreams to reality...
My best wishes for this magnificent work,
Azoele