Hi Jack,
no problem, im in the middle of a redesign on the ATX board, 1. having a basic full 15A +8V supply aswell and the rest of voltages that come out of ATX PSU (suited to S100 system power). and another board with just the various output from the PSU itself mostly suited for small lab supply. they will be made in 1.6mm FR4 and include a PIC10F Microcontroller for the on/off button logic and maby an interrupt input/output to the system. ill keep you posted. im just testing a prototype board at the moment for stability.