Trophy Room Help

I need help determining what is the best way to make a trophy room. I'm adding a room to my house with 12? walls and a 16? center peak. I would like to line the addition with plywood or osb board under the sheet rock. But what size of wood would hold large mounts like elk and moose. Would ?? hold a large elk or moose or would you use 1? 1/8? I would like to use ?? because of the price difference but not sure if it would hold the larger mounts? Any help would is greatly appreciated.

I built a new taxidermy shop last year and I used 3/4 ply on the walls then put Aspen T&G on top of that. I've got a huge bison and a couple of elk hanging on it right now along with a huge life-size lion. You won't have any problem with using 3/4". Be sure to post some pics when you get it done!