Does anyone know of a site with information on how to build structures such as skinnies, ladders, teeter-totters, etc.? I would like to build some of these in my back yard to help me work on my balance. My kids are pretty excited about it also. I have about a 1/4 acres of tree-ed area in the back of my property that I can set them up permanently. I won't have to move them to mow. Something like they built at 6M would be sweet. I'm going to try to get some free lumber from some construction sites.