Sabre sidewall construction

[4OfUs]

Hey all, I saw the video from a few years ago with them showing the Sabre construction process (very cool video especially how it goes from beginning to end of the entire process).

I'm still a bit confused on what the sidewalls are though? Are they aluminum or fiberglass? I see that they have an aluminum sidewall frame, but then it looked like they attached aluminum to that and put some kind of PVC over that??? Or is it fiberglass attached to that aluminum frame.

Thanks all for any help.

[4OfUs]

Never mind I found that they are made of fiberglass as I thought. Just was a tad confused when I saw the video.