ARS and Freedom Breeder plastic components

Does anyone here know what type of plastic ARS make their gliders/guides/rails?? whatever they're called (the channel the lip of the tub sits on) out of? And is it the same material they use for the backstops and toppers on their hybrid racks? And the same question regarding the freedom breeder toppers.

I ask because having the cost of either rack shipped would likely be prohibitively expensive. (I'm in Ireland so it would have to go by air). I have been considering asking a local metal fabrication shop about building the steel for me, and just ordering the same or similar tubs from a European source, and having the same fabricators bend aluminum panels to mount heat strips I'd get here. We cant use US electronics here because of the voltage difference. I'd just need to figure out the plastic. Worst comes to worst I would end up using metal for these parts, but plastic would be my preferred option if I could get the parts made here.

Thanks in advance for everyone's time.