Built a treehouse with my boys and I'm pretty proud of it

Spent 3 weekends designing and building a treehouse in our backyard oak tree. Used some old plans I found online, my neighbor helped me get the frame right. The kids helped nail some boards and we made a rope ladder entrance. Cost me about 400 bucks in materials but watching their faces when we finished was priceless. They've been in that thing every day since. Highly recommend doing this if you have the space.