im also trying to find the 400r flares. at the moment i have only found a place in the UK that makes them.
http://www.composite-design.co.uk/Skyline%20arches.html
When i first brought my car over, spirit of tas website showed that u had to put a rego in to book it, so i just typed NO-REGO and hey presto it let me book the journey and they didn't say much on the boat when loading the car.
Won't be a problem unless it's very unroad worthy. just need a temp permit to move the vehicle around. many a time have i shipped my 33 over to melbourne and back un registered.
Finally Secured another shell, and full 400r bodykit for it. now just need to source some new headlights and a im ready to start rebuilding the old girl.