what chips does an Amiga requires to boot
Short answer... almost all of them.
I would keep an eye (or lend a hand) to future Minimig development. It's already replicating the OCS chip set and sights are set on ECS and AGA chip sets for future versions. If technical advances can contiue on minimig, it wouldn't be such a far stretch to think about also replicating the buss allowing you to tag on some ZII or ZIII slots for vintage cards. If it gets that far, I don't know that we could call it 'mini' any more though. It's pretty much a clone by then.
Well I'm off to check on the Clone-A site to see if they have more to say yet.....
Plaz