I modified an older AT psu to work in my towerised A1200.
I triple checked power outpust five times before connecting it to the 1200... And it still works very well...
I am however planning to remove the power connector inside the a1200 and replace it with some sort of connection for ATX psu with powerswitch... That is to remove the external power cables and to modify my old chieftek tower to house the a1200...
A work in progress.... :-D