Also, I guess this may be obvious, but it is worth looking into regular independent repair shops for some work, like general mechanical or even light fab.
Case in point - one off road shop quoted me 325 to put in the front leveling kit on my Dakota. My regular mechanic said, "It's just the same as remove/reinstall the front coilover, so about 90 minutes so let's say $100-ish bucks plus $60 for the alignment."
Guess who gets the business?
And it's your build, so you can ignore me, but I like being a devil's advocate... so any consideration of a 4bt (like those in the surplus Frito Lay vans) instead of the GM V6? I know the gasser would be simpler and easier to acquire, but diesels are sooo cool!