i would think the hardest part would be using the correct size wires for each thing, but i guess if you go too nig it doesnt matter

i cant see why it would be all that difficult

i've considered doing it, but never really had the need

there isn't all that many things to wire up on a humble datsun and i think it wouldn't be hard to make it really neat too

i say try it and let me know how much of a pain it was

it would take ages, but if you make sure you have everything you need before you start it should be pretty straight forward

edit: at the end of the day the entire wiring diagram fits on half an A4 page in the car manual..... its really not that complex