I own a tree company... Climb almost every day.
Yeah, I built a little tree spot for paintball. It was like a fortress. I took three pieces of plywood and built a hexagon like Bowl around the tree with a hole in the bottom. Then I took a camo tarp and stapled it around it and cut little slots and holes around it just big enough for my barrell. And the tree was lollipopped so I couldn't be raided. So I'd just wear spikes when It started just run up the pole and into my little treehouse. Even brought a six pack and mp3player up with me a couple times. Just camp out above the flag... Some reason people always wanted to be on my team.
It was funny too cause when we switch sides theres no way for any of them to get up the tree