Hey, found some interesting info on the 4HE1. I haven't had time to wade through it all yet; many pages and I'm at school, but it covers the electrical and stuff I think.
http://lilaw.info/images/Manuals/LG4H-WE-9691.pdf
Also, I found out that if you don't need a lift for the 4BD2T, then you most likely won't for the 4HE1. Its only .8 (yes point 8) inches taller and 1.6 inches wider than the 4BD2T. The only places they really differ is in length. The 4HE1 is 14.6 inches longer, although with our long I-6 engines, I doubt that would be a problem. Its 25 kgs heavier than the 4BD2T, 803 pounds total. I have a post here...
Isuzu 4BD2T or 4HE1 - Cummins 4BT Forums that may interest some. So far, not much response. I may copy and re-post it up here. Thanks.