Where to get Logic Board/CPU?

[Deling Ren]

Hi all, I am desperately wanting to build a system by buying cheap parts.
What I want to build is more or less a PowerMac Mirrored Drive Door
version. I searched on ebay and found that most logic boards being sold
are older boards that use PC133/100 memory. Can anyone suggest any place
to get a logic board and CPU for MDD? Thanks a lot.

BTW, I wish to modify an ATX power supply if that is possible. I found a
site describing a mod from ATX to a Yikes PSU. But I know MDD uses a 24
pin connector, with a 25V for ADC. I won't be using ADC, can I ignore this
pin completely?

Thanks for any input.

Deling