Kach22i,
Its all in this thread, look at posts 9 through 20. Post 16 shows the under construction work the best.
https://ecomodder.com/forum/showthre...tml#post598593
It is Fiberglass over extruded polystyrene, built very similar to how I built my Aeroshell on my 05 Tacoma several years back.
Unfortunately I have been riding without it for a while, the transitions between the cab and the kamm did not turn out well, and I have been struggling with basically how to get it to come to a sharp thin point. Fiberglass over foam doesn't like sharp points. Initial attempts to span fiberglass by itself didn't fare well either. I need to either fix it or just put it back on as is.