I found a detailed set of directions for converting an ATX supply for a DA motherboard.
He suggests using the front panel power board from a B&W G3 for the 28V supply. I have one, but I'm probably going to save it for my B&W motherboard. I'm planning to use a Powerbook PS (24V). The frankenmac site you linked suggests 24V will be OK. I may be able to tweak the PB PS to give a couple more volts.
I would like to use a DC-DC step-up converter off a 12V line, but I can't find one cheap and powerful enough.
I would also recommend using an ATX cable extender, so you can swap out your ATX supply simply should it ever die.
He suggests using the front panel power board from a B&W G3 for the 28V supply. I have one, but I'm probably going to save it for my B&W motherboard. I'm planning to use a Powerbook PS (24V). The frankenmac site you linked suggests 24V will be OK. I may be able to tweak the PB PS to give a couple more volts.
I would like to use a DC-DC step-up converter off a 12V line, but I can't find one cheap and powerful enough.
I would also recommend using an ATX cable extender, so you can swap out your ATX supply simply should it ever die.