I built an A cat one last year, it hasn't been inspected yet so . . . After a lot of pissing about looking at various options and discussions with the builder we went for a KISS design. 19mm ply close nailed and glued all surfaces except floor (which in my case is 100mm CLT so ply already), particular attention to the ceiling so it can't be jumped on. Heavy solid wooden door with a steel skin, anti pry hinges, and the 5 lever lock. Mine really needs a 3 way locking system to make it bullet proof. Our frames are 140mm, and the walls are insulated. I've done enough building to know that it's going to take several tools, lots of blades/chains/disc's and an hour or so to break it down enough to get in.
Get in someone might but they'll probably just get sick of the hard work and noise!
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