So the gym I train at downtown (Forza) also has a small climbing wall. I would say 50 feet high and 50 feet wide. Not awesome but good enough for ARC'ing. I have also set up a series of identical holds that mimics a hangboard so I can do some hangboard trainnig.
I have become friendly with the staff and since I am the only one ever on the wall they pretty much let me do what I want with it. The wall has several varied angles.
The only thing I am missing is campaus rungs. I doubt they would ever build a campus board but it did occur to me that I could place campus rungs on the actual wall. They have a section ofthe wall that is slightly overhanging and would be perfect.
What I don't know is are their campus rungs out there that are built to be placed on walls with t-nuts? The only ones I find are meant to be screwed in. Does this type of rung exist?
I would try to get 2-3 rungs on each sheet of plywood. The thicker the plywood, the fewer T nuts you'll need. I suggest three rungs on a 3/4" piece with a T nut in each corner (4 total). Locating the holes for the T nuts will be tricky, unless they were drilled in a grid pattern.