I built the kids a vertical 8x8' wall at the start of quarantine. Then built a ceiling-mounted 8x3 to go with it. Since things kept dragging on, decided to build an inclined (more useful) wall. I'd been avoiding it, because drilling + filling 256 holes (in wood) isn't fun. BUT, the gym we are all members of sold us 5 5'x5' panels, pre-drilled, t-nuts installed, pre-finished (textured paint), etc. Professionally made panels for $50 each.
I ordered a bunch of 2x6x10' and waited for the weekend.
I removed the foot-molding, and pulled up the spike strips for the carpet, first.











