Climbing wall
Dismantled now and selling the plywood sheeting and three volumes, inclusive of the T-nuts. When assembled it's 4.5m tall and has the width of two full sized sheets, approx 2.5m. 19mm structural plywood so it's quite heavy duty. Over 1000 T-nuts used and approx $1500 worth of materials. The pic is of it how it was assembled but of course you could use the panels for whatever configuration you want to build at home.