Hi Steve,
I like your approach, however the difficulties in implementing the same software for the different OSes (eg CGX vs P96, Reaaction vs MUI) may make it difficult for anyone to claim any bounties.
I hope you'll get some constructive feedback on this from software developers in terms of implementing an effective bounty system which does what you are aiming for.
One point of note - on the "flavours" page the "authors" field seems misleading. I assume that this is the "author" of the news article (although why Amikit should show up as the author of AOS4.1 news article, and yourself as the author of the Amikit article seems strange), however on first reading it seems that these are the "authors" of the software.
Perhaps a front page describing each OS would be better with details of the developers/devteams involved, followed by articles (which could then be ascribed to individual authors).
Also, much of the content here appears to have been directly copied from other websites. Aside from potential copyright issues (for which I would assume you have asked permission), I would think if you are putting up an authoritative page introducing each OS variant, then the OS developers/marketing teams would prefer to have some control over what is stated here. For example, whilst the OS4.x page seems (on first glance) comprehensive in terms of describing features, the MorphOS page is incomplete - stating that "You will find a selection of core components described below.", whilst not including any such description.
I'm not trying to be over-critical or nit-picking, just pointing out some ways to avoid pi55ing off influencial people before you've even tried to get them on board.
I salute your constructive approach, and wish you well. When things are a bit more defined I'll be happy to get on board.