Well, the idea of my project (Rockbot), when done, is to have a engine flexible enought for people to (with some small bits of code editing) develop megaman games. It has an editor, only some special enemies behavior would need to be implemented.
I actually created it when I knew Capcom was not releasing Megaman 9 and 10 to PS2, and I already ported as a trial, part of Magma man's stage, but street fighter vs. megaman is a bit tricky for bosses, as there are things like Dhalsin's arms, but if you are interested, grab the editor (available for Linux and Windows), the sprites/tilesets and edit the maps to give a try. I am imterested in people messing with it, so I can find bugs or missing features... even if it represents more work to do