There are carabiners bolted to the wall in the correct locations on the overhangs, and one is bolted to the upper right hand side of the rear wall. (In addition to the normal climbing holds.) The types of climbing holds are "jugs", "pinches" "slopers", "edges" and "pockets."

As my day job allows, I'll build an outdoor climbing structure as well. We have some great ones at the base of every ski area and in every college and university here in Colorado, so there is lots of inspiration for this kind of thing. I won't really rest until I've modelled one of those as well.