As a former member of Pipeorg-L discussion list (not enough time for
it and MMD), I would suggest you contact them.  I'm sure you'll find
a very knowledgeable and mostly friendly group.  (I say "mostly"
because of the occasionally heated discussions they may have.)  You
might also try http://www.theatreorgans.com/

Good luck. Sounds like a fun project.

Bill Budenholzer