I would guess it's aluminum, as Scotty trailers have traditionally been so (although the main info page does not specify that I see). If it is 'glass, it's definitely not molded (trailers sometimes use 'glass panels to make a trailer in the way that stick-built trailers traditionally used aluminum).
PS: I like the bed that flips to a couch during the day, and... interesting potti solution.
PPS: Now that I look again, I'm a bit confused. The "floor plan" shows the potti in the "usual" position forward of the kitchen on the driver's side.
However in some of the photos (what made me remark on the "interesting solution") it looks like the potti is just to the left of where the sink would be on a Boler/clone 13', as if it is just ahead of the couch/bed and somehow converts to a potti only at certain times, with a permanent dinette forward. Seems like there might be two floor plans and they only show one, but have photos of both. Always good to get a few new ideas.