I built a toddler climbing toy for indoor use. It is very simple and just made from 2×2 lumber and closet dowel rods I bought from Home Depot. I think the total cost of the materials was $50-100. I cut the lumber to size, then screwed together everything. The base is 8′ long, the back side is 4′ long, and the long side of the triangle is around 9.4′ I believe. The dowels are around 3′ wide.