Ok, I like this idea.
Ive been working with MMF for... years now.
I found out about construct from SFGHQ actually, some years back.
I am/was good with MMF but I haven't had it installed on my machine for roughly six months.
If I can, I would love to contribute to this project though. as I've been wanting a sonic engine since the day I switched to construct.
I worked on one myself (Not 360, but a classic "Static" engine) but didn't get very far due to an annoying collision bug. (It was colliding with the slopes bounding box, not the ground itself.)
So yeah, if I have the time i'll see what I can do. Best of luck guys!