Haha you should have seen the treehouse my friends and I built when we were in about fifth grade. It was probably 15 feet off the ground and put together with as much carpentry skill as a group of 11 year old boys had, using boards and plywood scavenged from our garages or vacant lots. Fun times. Pre internet era, nobody had a phone and video games meant pac man at the arcade if you had money to play, or maybe Pong on a TV set.
yeah I built one of these out of pallets when I was 10 and it had to be torn down when a neighbor kid stepped on a rusty nail. Fortunately they didn't sue my family. I understood the concept of a hammer and nails, but that was the limit of my knowledge.
I’ve built an underground hideout using discarded washing machine panels for wall support when I was about 11 or 12 years old or so. Safety was a word I’d never heard of back then...