Awesome job looks great.
I bought my 2nd Gen a few years after it was fully rebuilt by someone, a few things they missed or did incorrectly that would have saved me some time all mostly mechanical stuff.
Oil Pan was replaced but they did a terrible job with the gasket so it leaks bad, I actually carry cardboard when I go to places I know it will leave a mark.. Thats a project to redo. Its on my list..
Same goes for the front seal, mine leaked bad, as did the PS pump/vacuum pump. Would have been great to do the front seal and timing cover with the engine out. I got a new front timing cover from Cummins.
They reused alot of old hardware, they painted it, but did not blast it first so most of it rusted. I bought a decent assortment of metric stuff from McMaster and have 4 nice bins of the HD stuff. Same goes for the plastic rivets I have a good assortment of those.
Wiring harness like the battery cables I replaced mine and cleaned up the grounds, some locations had paint on them from the rebuild, I used the copper infused antisieze on almost everything hardware and
I bought new battery boxes, mine were shot, they were cheap for 2nd Gen, no clue what a 1st gen used and if those would be available, I know they only had one battery on some models, it could be metal for all I know.
It does not appear you need much help you look to be doing great.