That Moya concept looks really cool, thanks for sharing the pics!
For a long time I thought the across the top "part 2" you labeled was a seperate piece and the whole DRD was cobbled together from multiple overlapping vacced plates but that seemed like a lot of work and too difficult to get to line up correctly. This picture:
yes it was in 2 peaces, each peace was at the limit of its pull tolerance . but the advantage of doing it this way was where the seams met is where the ABS was at its thinnest so when you glued the 2 halts together the hole thing became very strong, which is what you need for TV shows. I was the go to person at Hensons for Vac forming because I was the first person to vac form my cores . this one is from babe but I started way back on Dinosaurs the TV show.