here is my work log/guide for the saturn.
1st i opened it up and took out everything out then tested the power board to see wot volteg it needed it got 5 pins just like the dreamcast.after testing,the 2 pins at the frount are ground the next 2 are 5.2v and the 5th is 11v.so after conected my battery to the 11v line and a 7805 to the 5v lines the 11v line works on 9v and the 2 5.2v lines work on 5v.then conected up to a screen here are the pinouts for the screen
pic was beffore i fryed my ps1 screen then wired up the pad
then put the screen and controls in to the frount of the case had to use a screen from a dvd player fryed my ps1 screen.
then put the sides of the case on and put the main board in and wired up all the switch.put the VCD card in and wired up the triger buttons
then put the back of the case on and a cover over the cd drive.
size it 29cm by 22cm. 5cm,8cm where the cd drive is it can be smaller if i used a ps1 screen but fryed it