Definitely box over box, that is just common sense.
My much larger design necessitates a power roof mechanism but yours does not.
I was thinking an inflatable seal, but simple "pool noodles" or something similar can be put into the gap to keep out the breeze and bugs. A large soft rope would do.
I plan on a 2" overlap when up. That plus a good seal will keep that R10 insulation.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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