If you`re going to get a pc power supply,
might as well buy a full tower, and a hack-saw!
just fit the lot into the tower, it`ll take you an hour.
i`ve got some pictures on my site , of a standard
tower that i removed the back, ( turned it up-side down).
and tied the 1200 mobo still attached to it`s plastic base, into the tower, ( it`s tied there with ribbon!)
The 60 processor uses 3.3volts and runs a lot cooler than the 5v 040.
As for the PPC.... a fan is a must!
There are some really quiet fans on the market, And its worth getting the munition grade ones, as this will cut down on the running errors,( and increase cpu life...)
:-D