This topic started in roof vent fan thread. Refer to message #1582.
I felt the topic warrants its own title and maybe others will add their unusual build experiences to the thread.
StretchMike RE: floor and panel 4 tabs not lining up.
I cut my floor to the it’s actual size then routed in notches and epoxied in some 9 mm scrap *biscuits* and inset them into the bottom side 9 mm deep. I did some quick measurements and notches and tabs are close if not right-on. The bottom is kind of buried right now. If there is a problem in fact, it will be easy to modify with no loss of purpose or strength.
I think I will go with inserts in ends of panel 2 to solve the length difference. Some lightweight glass cloth/epoxy for added strength, then continue with the hatch lip.