I've been searching through the forum for some time now, but cannot seem to find a good tutorial on how to build haunt walls. I did find the link through the monster list for the 2x4 walls with plywood, but I'm not sure that is along the lines of what I'd like. It seems like I see a lot of posts about 'how' to make the walls, but no real pictures or anything of the walls themselves. There are two methods I've been trying to find more information on. One of them was a PVC frame that you can make and hang some 6mil plastic from to make walls. The other is using a 2x2 and OSB board to make walls. I really am leaning toward the latter of these two, but my question for it is how do you brace the wall and keep it from tipping over? Obviously I don't want a wall that can be run into and knocked over. Thanks for your help!