Just wanted this here if anyone searches. For hinges, GN1 plans say to use eyebolt AN43B-13. That is 1 1/8" nominal length, but you need at least 1 5/8", so the eyebolt should be AN43B-15.
1" beam + 1/8" ply front + 1/8" ply back + 1/4" nut + 1/16" washer + you need at least one full thread exposed.
John C