I wouldn’t be worried about the shell and construction methods. If you look around, pretty much all the composite campers are built the same way. Composite panels joined at the edges with extrusion and adhesives. OEV, Total Composites, Cascadia Composites, Lemker Overland, Globetrekker etc etc all build them the same way with some variations in panel and extrusion material. The tech and that way of building them has been proven globally over a decade now. The adhesives have a ridiculous break strength and will not come apart. The only company that I’ve seen that panels have delaminated or come apart from the extrusion is Scout campers which is essentially the lowest quality build you can get. They aren’t even in the same league as the other companies I mentioned.