-
I lapped them myself
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.
NotThamesWater-
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.
BareNecessities
Thanks. I lapped them myself, as there's just too many weird angles in that shed to have anything pre-built :-)
Have a good think about building in security beforehand, as it's really lacking on standard pre-built sheds.