Stripped the parts off another build and assembled them!
The trigger pin holes are not as tight as my other factory lowers. Anti-roll pins will take care of that.
The rest of the assembly went great! Safety works, trigger works. Bolt catch works, mag release works all set!
The rear take down shelf was already milled out from Range Tool. I left it as is and it looks like it may be about 1/64" or 1/32" too tall. The rear takedown lug on one of my uppers wouldn't fit. I am going to try and smooth the insides out with a dremmel sander and that should also take the top off that rear shelf. One of my PSA uppers fit but I had to get a punch and force the rear pin out to remove it.
On the whole it is my first pretty much complete AR lower. It functions and is not pretty but looks like it will be functioning soon! Woo Hoo!