Built a treehouse with my kids this summer and it turned out awesome
Spent about 6 weekends building a simple treehouse in our backyard oak tree with my 8 and 11 year old. Nothing crazy, just a 8x8 platform, some railings, and a rope ladder. The kids actually helped with most of it instead of just watching. We hit some snags - miscalculated measurements, had to reinforce the frame - but worked through it together. Now it's their favorite spot in the world. Honestly been the best father-son bonding I've had in years.
This is exactly the kind of project I want to do with my kids once they're a bit older. Props for actually seeing it through instead of just talking about it like most of us do.