I mentioned a few weeks ago some scary-ass playhouses built (at astronomical expense) to resemble miniature mansions. This is at the other end of the spectrum - a dad built a MechWarrior treehouse for his kids, inspired by some old shipping crates. I think that’s the coolest thing I’ve ever seen, although when I was little I had a babysitter who had in her backyard an Imperial Walker, bought when her son was a youngun. It wasn’t nearly that big - maybe like eight or nine feet - although it seemed enormous at the time.