This is very interesting. Just today while driving many miles home, and passing a popup camper on a flatbed truck, I was thinking why not bolt a camper to the truck without any flatbed. You'd need the camper floor built stronger, but save the weight of the flatbed.
I suppose you can't use your truck without the camper with this setup. We've only used our truck without camper a handful of times though.
I use a composite bicycle and designed some of the 787 "plastic" airplane, so am not concerned about composites in general if they do it right. There are many weight-saving features like the honeycomb panels. The zippered windows might bother me -- zippers seem to be the failure on tents. Velcro seems a bit safer in the long term.
It would be interesting to see a version without all the bells and whistles to see how much it would cost -- their current cost is pretty scary. Maybe after a few years they'll offer some without hot water and shower, smaller battery, fewer solar panels, no awning, no toilet, AC, Propane instead of an induction stove and associated inverter, etc. that might compete better with FWC and ATC prices. But probably it'll cost a lot more. On the other hand, if the weight is as low as they say, a smaller truck would work to save a few $$.