PVC in "a place of assembly", thats a no. Romex in pic #3!
"Article 518 applies to places of assembly designed or intended for 100 or more persons. Article 518 would apply, for example, to a church chapel or auditorium for occupancy of 100 or more persons, its capacity determined by the methods for occupancy population capacity in accordance with NFPA 101, Life Safety Code."
Double lug neutral in panel 1.
Ground and Neutral mixing at various locations.
Bonding in various locations.
Phase idendification is a minor one.
As for GE, it's not "cheap", but twinning them out, that's cheap.
The maluable off-set, now that's cheap. On a main, I wouldn't do it. Not sure if its kosher for protection of service conductors.