They are structures on the same idea as the Red-Tree Follies, that is, they are stone structures built for a single-night stay but sturdy enough to last several decades if not longer: metal roofs, thick walls and windows, heavy door, thick foundation.
And uh. I added a cross-section of a bedroom and the first floor.
And this is an Excel-ization of something I sketched up in a long meeting, done by random number and emoji generation and thus with some sort of ridiculous bits.
It’s for my Camp Nano plan, something called “Hard Mode” which will involve a lot of going through portals, in theory.