This next part isn't so great.
Sounded cool at first, but the result isn't what I'd hoped.
Decided to suspend monkey bars from rafters.
Used eye-bolts through 2 2x4s and L-brackets to secure them to the rafters. Hanged the whole set up with quick links and chain.
The idea was originally that a cargo net will span from the base near the edge of the rock wall up to the monkey bars, but I'm not feeling it right now.
Maybe it'll shape up, or maybe I'll scrap that and do something different. Not sure yet.