Bulkheads are in and set. There were some minor fit problems but are easily fixed. You are better off to fit the fuse. sides then add the bulkheads. The sides and top blocks are two diffrent lengths. I popped the bulkheads loose to reposition. I used the aft portion as my zero starting point and worked forward as per the instructions. Not a big deal just 1/8" at F3 and 1/4" at F1. F2 just slides right in dead on square to the 1/16" ply plates.