i had high hopes for this site after i saw a post in the zendrum forums that featured a very nice custom built controller. unfortunately it is a dead end for my purposes. as far as the megadrum is concerned, proven professional devices exist that require no time consuming DIY frankenstein creation and cost much less if you figure in the labor and headache involved, easily below $200.00 US.
however there is a great market for controllers especially custom made.
no offense when i was a kid i liked building those radio shack/tandy kits too, just to see if i could.
good luck