My first 'PC Clone' was made with one of those
old 63.5 watt IBM
supplies. In a totally non-matched Leading Edge Model D case. To fit
the supply in such a case, the supply circuit board had to be completely
removed from the steel case and just bolted inside the Model D case.
I converted a bunch of IBM ATs into AMD K6-2 machines. And all still run
happily today, whereas others built at the same time made with newer AT
power supplies, all have died, and almost without exception, it has been
either the power supply itself, or something damaged from the power
supply.
-chris
<http://www.mythtech.net>