Its 15mm aluminium now, 25.6Kg for them both. I am quite worried about bending, so there will be lots of support pillars going between them, mostly in areas where things are attached to them.

We have some Nylon Alloy910 which is pretty ridiculous how strong it is. Should be fine at 100% as long as it doesn't suffer any major impacts.

We also have a major price problem, the current estimate is like £6500 for the whole thing. Which is just a tad more than we want to spend...