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How did you cut them?
I borrowed a basic chop saw to do most of the cutting. Then, rather than work out loads of angles, I overlapped the edge of all the diagonal sections. That way, I could roughly trim them by hand, with a panel saw. Then tidy everything around the edges with a router.
Brad ( flat headed ) galvanised nails for fitting them. Making sure to pre-blunt the ones used near the edges, so as not to split the wood.
https://www.youtube.com/watch?v=dhq86WIBV1E
I then fixed vertical strips of hardwood quadrant moulding along the corners, to cover the exposed end grain of the shiplap boards.
Strong work! How did you cut them? I'm thinking of a circular saw, and a jig for crosscuts.
Do you then just nail them in? I've not yet started that particular YouTube rabbit hole journey.
Security-wise, I totally agree - main security will be cemented-in floor ring and chain, and maybe some steel reinforcement in the woodwork. Luckily, break-ins aren't a thing around us, so I don't need to go nuts.