Firstly here are some pictures of the underside of the boot floor. All these pieces interlock and leave gaps for cables, screws, brackets etc. The birch ply will be given a protective coating to stop is soaking up water.
Today we installed all the carpet (except the boot):
The whole things like a giant speaker box with some very complex edges, that came with carpet that doesn’t quite fit! There’s a step by step on the page here. We needed one and a bit cans of spray glue overall.

