I can DEFINITELY help with this! I've actually conquered 80-90% of the editor that came with JJ3 (in a month or two, NO HELP MANUAL), so I can do levels. Plus a few graphics.
I can do some pretty okay music too, so I could do that, if all else fails.
I was actually building my own JJ3d level and thought I'd never be able to show anybody, so if we are able to do it, I am totally 100% in.
Let's indeed pray this works. I want it to.