Yep, although swapping RAM around seems to cause strange behaviour. I swapped all 4 sticks and still no go, except now the card in slot 2 wasn't working. Swapped a known good one into slot 2, and now slot 4 isn't working right!

Sounds like a lemon, but it boots, it runs and it runs pretty decently sans 64mb of RAM. Still, i'm curious to know if the iMac G3 would outperform this system as my brother (it's his machine) can't really notice much difference between the two, except about three times the desk footprint and twice the power connections. If the G3 ends up being faster, then it may be worth switching back and making the Yikes into a server or something.