ProjectAI does not allow to post "complete" AI planes based on their materials. It is allowed to post only repaints for their airplane models. My plan is to paint the textures and made somehow an installer which will make complate AI planes from PAI models and my textures. Perhaps I will call out for some help when reach to this point.
The real good point is these planes do not drop down your framerate. I realized that additional scenery is much more framerate eater than more AI. Although, for more AI planes, more RAM is recommended. I think 500 MBs RAM is enough for a good result (of course alongside with a GeForce4 or GeForce FX card...I do not really know the Radeon side, sorry).
I would not say a release date now. I am sure the site will be up again much sooner than I will finish painting. I need about 3-4 hours per plane, and I usually do not have a so long free night after job. For beta-testing I am planning to release somehow a package with about 10 planes from the higher classes. You can expect it within some weeks...