[Dimis]

Finish the kit in SA.
Once it's fully registered it should be no different then transferring any other vehicle.

Ie. RWC, Proof of ownership, and VIN.
Being an ICV, I'd keep my compliance papers and eng Certs handy, but I'd find it highly unusual if they asked for them. It should really be no different to registering and transferring a Toyota Corolla.

My post is based purely on opinion, which is based purely on my experience transferring other vehicles.