I expect I'll have an internal battle when that day comes because plywood is functional but looks terrible. I'm also intrigued by doing the metal like Shane did. That turned outI would skip the drywall and go straight to plywood. I regret sticking drywall on my walls. It gets dings and holes way too easy and often. If you had plywood, it would be significantly stronger more durable, and you could add accessories literally anywhere.
Lots to get to before that point though and I hope to have a better idea about where everything will go at that point