What exactly do you want to know?
There's so much to learn when going from Jeep/Dana stuff to Toy stuff that it's hard to just school you on it.
Here are a few highlights though:
Cone washers suck
Longfields are the shit
Stock rear axles are amazingly strong
Keep your steering arm studs tight
Dropout thirds are awesome
Avoid Trail-gear because they're shady people
Plan on long lead times if you order from Marlin(one of the good people in the Toy industry though, so I do what I can to support him)
If you're wondering what to look for in terms of toy axles. You want an 84 or 85 front housing. They're better gusseted from the factory. Although you can add gussets to any of them. For under a Sami I'd think the earlier rears(85 and earlier) would be good because they're a bit narrower than the later IFS axles(55" vs 58") and they're cheap cause not many people want them. There are a lot of good deals on Pirate these days for used beefcake Toy axles. We're talking Longfields, high steer, ARBs, 5.29s etc.
Depending on the budget and his abilities you might consider a more modern Toy engine than the 22re. Perhaps the 2rz or 3rz. Something to think about. I don't think they're really that much more expensive, but they have more modern equipment and make a bunch more power. I'm talking like 45HP instead of 20
Edit: Doh, nevermind about the engine, I forgot you're going diesel.
There are a bunch of toy guys on here as you know, so ask away.