you are not the first hiding your mdd in the next room.
abt the psu: i once tried setting a quicksilver to work with a atx powersupply (w/o 28V for ADC). didnt work. the LoBo seemed to require the 28V for powermanagement. dunno if the MDD would work. just try. pinouts can be found here http://www.outofspec.com/frankenmac/wire.shtml/