Few progress shots from bracing the set with some old canvas frames, to try and get rid of the warping from the layers of glue, and it seems to be working so far so fingers crossed! It's been a slow process of PVA glue,  clamping to hold things in place while they dry and then hot melt glue-guns to finish off a few edges and struts to hold the whole thing together and make it nice and firm. I've gone a bit overkill as I'd rather make it too strong than have it collapse/deform halfway through the project. It's a bit of a bodge job, but I figure that gives it a bit more character.