If you find Riverhouse Mini I would definitely give them a shout. I think they do the best importable restorations of anyone I have seen for reasonable money. You can get a nice LHD restored to your spec and obviously given great attention to paint and bodywork and you know it will slide right through customs because it's all original. If you are looking for 'custom' I wouldn't even bother with NAS trucks, their value is in their originality.
Also line-x is usually a bandaind for rusty bodywork or shit panels. It seriously kills the value of the trucks (as best I can tell) but if you're going to do it, do it to a ROW/EU truck, not a NAS for christ sake