I have a treehouse in my backyard built by a previous owner. It's actually pretty cool treehiuse, but a little rundown. I would like to take down the walls and the roof, but keep the platform, and build onto it so that the kids can run around on the platform, and have some attached playground equipment, like monkey bars, slide, rope bridge, etc.

Have any of you had any experience doing something like that in your yard? Do you have any recommendation for an OEM playground wholesaler? Should I just try to build it all from scratch?