I had a heck of a time lining up the galley hatch and finally after the third failed try with tape used 2 inch deck screws. Centering the hatch I drove two screw through the “hatch lid” lip section spaced to near the bend but in the center section below panels 1. I glued the center thick hinge blocks to the roof and bolted the 4 side plates to the centers. I then drilled pilot holes down the centers of the side plates and tightened the screws until the side plates were flush and snug. A little tweaking to the back 2 screws and it all lined up beautifully. After the epoxy putty set, the screws were removed and the holes puttied closed.
I don’t mean to be overly critical because the manual is very complete, very well written and illustrated. BUT in places it assumes skill sets many of us amateur builders just don’t have – at least skills I don’t have. I’ve personally gone off script in a number of places to compensate for my lack of skill and neighbors ready and able to lend a hand at just the right time.