Well done on getting the moke running, rego and smiles soon hopefully.
The PO's wiring skills sound like they were some what lacking using house wire
I think a couple of the guys have got new looms from 'classic wiring looms' link here
http://www.classicwiringlooms.com.au/and a happy with them.
As for the seating issues I guess the legal way to change the comp plate is to get an engineer to look at it, the thing is a moke has
captive nuts and seat belt mounts already in the back so in theory you could bolt in some front seats and belts and
it would be a safe as it ever was and probably as safe as an engineer would make it