I'm gearing up to build the kid's a treehouse/clubhouse; wife wanted to get a playset but for the money I think I'd rather do a clubhouse type setup instead(seems like as they get older they'd enjoy that more). Anybody got any tips, warnings, must-have features, features never used, etc? In my head I'm picturing two "towers" with a bridge connecting the two with swings under the bridge. One tower will be enclosed and pretty much weatherproof and the other will be mostly open with some playset type stuff(climbing wall, slide, etc).