Dow rods, model car tires, craft sticks lots of sand and spray paint.

I originally started working on this as a group of Cobra Basic Training play sets. These are unfinished pictures, I haven't decided if I am going to fill the rest with dirt or grass, but I think its a good start. I used dow rods to make the main structures and all of the logs on the play set and then used craft sticks to simulate 2x4's and 2x6's. The rope is plain nylon rope I spray painted brown.