To echo Nuwidol, I would love to hear the B22, tranheiu! I'm just getting into DIY myself, having recently completed a CMOY and a couple of Velleman kits (to get the hang of through hole PCB soldering). Now I'm researching a Mini3, then I plan to build an M3 (first with off-the-shelf PSU, then a Q11), followed ultimately by a B22+S22(s) - I hope. Having said that, I think the safety around "exposed" AC line voltages is something to be considered - are you able to fashion a temporary cover for the power supplies, and perhaps some warning signage, just to be on the safe side?
I look forward to having a chat with you about DIY audio!