The books recommended are good sources. What I used along with help from the forum. The money invested it may not be a bad idea, my opinion, to go through Brent, Blair, Ross, or Barry at least on the short block. To me, the short block is where most errors will arise, in a very general sense. Mistakes can be made on the top end certainly, but most guys tend to be familiar with that and there tends to be more leeway.
Barry's book was a good help to me along with this forum and net. I am meticulous but still made some mistakes that cost me, but not to the extent of blown motor, and it was my first engine ever to build. When using modern parts, it is paramount you know the little details and changes so you do it right. A build check list with notes is your friend!
My guess, and it is purely a guess, is either a plugged feed in the crank or maybe a crack in the journal. A crack in the main feed should have shown on bearing wear. Odd those two would be the only ones that showed a lack of oil unless the tolerances were way off on just two. A full system of low oil volume "should" have shown up on other parts imo. Low pressure sounds like an internal leak, unless it was routed wrong but again very odd only these two are effected. The psi you listed is low for a full on run for sure.
Sadly on a self destruct it can be tough, or impossible, to find the issue. Just really depends on what evidence is still left.
Which piston was missing material on the wrist pin? Sounds odd it would end up wedged but a lot can happen with parts moving around and break rapidly, or flipping a motor on a stand.
Best of luck. Never a good day when a new build goes south.