Hey, here's my layout for the Mega Percussive Synth... Sorry I kind of dropped the ball on this one. Let me know if you see any revisions that should be made, and keep in mind this is currently untested... Holes are designed for alpha pots and I've found it helpful to drill out a small area behind each pot so that the nuts thread.
Hopefully I'll add my other designs with revisions soon.
Enjoy!