lab power splay from ATX computer PSU

WOW that's a long title. But to cut to the chase Im in the prosese of terning this computer PSU into a lab powersplay. It may look complex but it isnt, all that I need to do is to separate out that lage bunch of cables(2nd photo down. bot-am left) into voltages. To start the thing going All that I need to do is put a swich bitween the green whier and a grownd(3rd photo down).

Will post more on this, George out.