Really can't say enough about the quality and craftsmanship of your design! Please count me in for a group buy for both PCBs, LED, and other components if possible. 8) I think a group buy of 50 might be a little small as your project is starting to get some notice over at the lemon64 forum as well as the Prophet64 forum. ;D As for the SIDS, I've currently got 4 myself in addition to the one in my working C64c.