We built ours completely from scratch. Our barn is a "converted" dairy barn, so we had to jackhammer the odd steps and channels out of the floor, and then make holes for the main corner posts of the stalls. We used 4x6's for the front corners and the doorway, bolting those to the ceiling beams and cementing the bottoms into their holes in the floor. The back 2 corners are 4x4's bolted to the barn wall. Midway between the front and back corners are 4x4's, bolted and cemented like the front. From there, we took 2x12 planks and worked our way up the walls, I think about 5 high, 5 feet, more or less, since "they" don't really mean 12 inches :roll:. From the top of the boards to the ceiling we ran woven wire in lieu of bars. Somewhere I have a picture taken right after the stalls were finished, I'll have to try to find it and post it.
It was hard work, but well worth it. The stalls would probably hold rampaging elephants, and are holding up well. Sis's QH is pulling his wire down, we may just run 2x4's as bars around his if he insists on tearing the wire apart and making scratchy edges.
Word of caution: Don't use pressure treated lumber anywhere the horse can reach. The chemicals in it are far from horse-friendly if they start to much it.
A stubborn horse walks behind you, an impatient one in front of you, but a noble companion walks beside you ~ Unknown