Built a Moonboard in the garage. This is how I did it.
Freestanding Climbing Wall Videos:
https://www.youtube.com/watch?v=T99ZtfwgEUU
https://www.youtube.com/watch?v=UtR56KPKzGQ
https://www.youtube.com/watch?v=RfmLz9rSqSs
Mini Moonboard:
https://moonclimbing.com/mini-moonboard-diy-kit.html
Cost Breakdown:
2016 Hold set with bolts and t-nuts from Moon Climbing + shipping to the US: $1,121.87
Lumber, plywood, and screws from Home Depot: ~ $250
Cheapest Miter saw I could find: ~ $120
Drill Guide: ~ $40
4-pack of clamps: ~ $20
Total Cost: ~ $1500, more if you build it outside