Panelized simple shed row stable, I think I would bring the mesh between stalls all the way up the ceiling. Possibly partial solid panels for horses that prefer a little more privacy, especially while eating.
I love this!! Feeds one round bale or six to eight square bales. All treated wood, solid roof sheathing, keeps hay off the ground, virtually eliminates waste and spoilage. Every edge is chamfered for horse safety. Built on skids, the unit is completely portable, so I can move it to fresh ground or another field anytime, pulling it with a pickup truck. It wasn't cheap, but it has paid for itself in savings in hay.