A little carpet adhesive, a few staples, a handful of small brackets, and it's almost complete! Overall, it's solid as a rock and has enough mass to keep it stable without anchoring it to any walls.
Only things left are a ramp from ground level to the second story across the front and potentially a hammock somewhere(I'm struggling to see where i could put one without compromising some other useful part of the tree).
Thoughts are welcome!
it really is, lol.
it really really is. Another option, if you're okay with it not being a floating shelf is a pair of keyhole brackets fixed to wooden braces. The braces then are bolted into the shelf board (You could leave them floating if there was no, uh, cat...).
Then, some glue-down carpet squares for traction. (if they're up high you won't see it so get the ugliest cheapest discards you can! I mean, uh... go for that cyberpunk-chiq look. )
I think if I did put in a run, it would have to be as unobtrusive as possible, so floating shelves are more or less mandatory.
But I'm probably not gonna end up actually doing it, so the point is moot