LHD is very hard on the Skylines, and I seriously doubt he has "many" of them.
In order to get the steering column mounted properly, the turbo locations and the exhaust manifold must be reconfigured to allow for the steering column, not to mention the airbox, reconfiguring the power steering pump and locating it, relocating the throttle cable linkage, clutch cable linkage etc etc.
it is not easy, and it takes alot of custom fabrication to do it.