i want to make a n64p but i hav a couple of question firstly what fan can i use in my system (what voltage) and how hard is it to relocate the card slot
A 5 volt fan would probably work good. As for the cart slot, from what I've read, it is kind of tricky because it has to also be connected to the expansion port.
Yea, it really isn't that hard. If you take the Extension port off, solder your wires to the hooles from that. If you don't take it off, pust the wires in fairly deep, and put it in the regular holes.