I bought one of those bodies and have some minor gripes about it. First off, the handle routing may look correct from the front, but on the back it is not done like Ibanez. Secondly, the neck mounting screws do not line up with a standard RG550/570 neck correctly(maybe a Korean neck will fit better?). The Japanese neck was too far forward by several mm(big gap between the
neck pickup and the end of the fingerboard) and would never have intonated(the solution is to drill new holes in the neck heel). Also, you will have to drill some holes to get wiring thru to the
pickup cavities and trem route for the ground wire. The pickup holes have flat bottoms so you may or may not need to make adjustments for whatever pickups you install. Go here
http://picasaweb.google.com/albro1952/SwirlJem
and click the SLIDESHOW button to see one assembled. Also note that the cover routing is a little too deep so Ibanez covers are sort of sunken in.