The place is 56 by 64. That's the 56 side. The people who put it up messed it up and so the distinces between poles are messed up that's why we put plywood up. Also to keep it warmer, and to have a wall. The stalls are for bad bad weather, if someones hurt, or feeding oats. They are in them for 20ish minutes a day. Im not sure how thick it is but its really heavy and seems a lot thinker then normal stuff, dad got it.
We got the stalls from a old boarding barn that didnt have back walls either (all the barns I go to don't have back walls either unless they are back to back..)