I have yet to chat with that guy, but...

I would start cutting away at the firewall long before I would consider doing anything with the rocker covers. I don't think exhaust will be a problem stateside as it's virtually identical to GenI design. I'm hoping that the 3.0L oil pan will fit on the 3.5L, but I don't have any measurements on that yet. A huge wiring task is to be expected. The fact that the guy mentions that it took a good mechanic to get it working makes me wonder if he had anything to do with the transplant, or if it was just handed over to someone to "make it happen"?