Great write up! I remember the first time I replaced something more serious than a headlight on a car (my water pump), and I was terrified I was going to somehow blow up my motor in the process. Having a good guide makes everything easier. I do have a question though, and I apologize if it's been answered elsewhere but an hour and a half of thread searching and googling hasn't given me a clear answer.
Are the timing belts from the VG30 and VG33 interchangeable? As near as I can tell, the motors are largely the same (save for bore and water pathing), but the camshaft and crankshaft sprocket tooth profiles are different. This would lead me to believe that the belts for each motor are marginally different in design, if not in tooth count/length. I ask this because, before my WD21 was stolen, I purchased a new timing belt and hadn't gotten around to installing it. Now that I have an R50 of unknown mechanical heritage, I plan to hit the timing belt and all related goodies for safe measure. If I can use the belt I have, great. If not, I'll have one to toss up in the For Sale section.