East Wall and front of stall entry. Front of stall South Wall West Wall I am planning on enclosing the ceiling by attaching corrugated light panels (26"X8') to the rafter bottoms from several old barn doors. That should be strong enough and yet allow a lot of light in. The panel will be finished with J molding on the ends. I am going to build in some side supports to attach 1/2" hardware cloth around three sides covering from the header up to the new ceiling. I am not sure if this will be too drafty even though it is in an enclosed barn. The other option is to enclose the gap between header and ceiling with OSB and leave screened cut outs with hinged doors to open and close for ventilation. The stall bars are on two sides and I will enclose them with more of the light panels that I have on hand. I am going to build an hinged door with screened window that is slightly inset in the opening. The door will have a pop door hinged at the base (with an eyelet hook at the top) that I can drop down and will double as a ramp. I was going to have 2, one inside and one outside because the pop door will be about 10" above floor level. The floor is packed (from years of horses packing it down) slag/pea gravel mix, and covered with a 3/4" stall mat. I am going to put 1/2" hardware cloth 12" up the wall and try to bury another 12" down. If I can't dig it up, I will fold the cloth so it extends under the mat the 12". I can stake the hardware cloth down under the mat. My intent is to totally critter proof the stall. Even though it is in a barn with doors at both ends, critters do get in occasionally, but mostly mice that I can see. Barn has electric and water. Oh, the stall is 10' X 12'. Walls are 9' high and 12" from header to rafters. Door entry is 4' by 82" I would appreciate any advice and I haven't even figured out how to layout the inside of the coop except that I was going to suspend everything off the floors so plenty of room for chickens and easy clean-out.