That is a very unique coop. I've never seen one like it. How big is the floor area of the coop? The rule of thumb for a coop's floor area is a minimum (more is better) of 4 sq. ft. per bird. Since you are looking at up to 6 chickens, that means you need a minimum floor area of 24 sq. ft. An overcrowded coop can quickly lead to aggression, fights, feather plucking, and even cannibalism.Here are some pictures of my "outhouse" coop in progress. I don't have any actual finished pictures.It is 2 pallets high and 1 pallet wide and 1 pallet deep. This is before we finished the plywood "siding". We also put some metal roof scraps on the slanted roof pallet to make a nice roof. We moved it after we took these pictures and I can say it was ridiculously heavy already at this point. I only wish I had made it larger...perhaps 2 pallets deep and/or 2 pallets wide. But I only ever wanted 4-6 chickens so I didn't need a huge coop. The gap between the top and bottom of the pallets along the walls was perfect for stuffing batted fiberglass insulation on a roll. Then I covered it with paper machine wire (a synthetic woven mat, basically) so the walls could still breathe a little but the chickens can't get to the insulation. I left the gap between the top of the walls and the metal roof open as a large vent around the top and it works great. I just put hardware cloth on the outside of the vents to keep out predators/wild birds. I like that it is tall enough to stand up inside (not that I spend much time in there!).
Horizontal is a good idea for more floor space, but I will say it is very heavy. You will need a tractor to move it. I chose vertical for ease of access by people. I do not have any pics of the inside right now, but chickens like to move up so vertical makes sense. I put two roosting bars in right across the coop from left to right so they have plenty of space to hang out. I just put nesting boxes in a couple of weeks ago. They are inside and I only have two since I only have a few birds. I was going to put them side by side, but since my coop is vertical I stacked them on top of each other (after reading some nest box threads here). They are attached to the right wall close to the door so that you can pull eggs out without having to walk into the coop. They are attached to nails that are bent up on the end so they just hook on so I can pull them out easily for cleaning. I used milk crate type boxes (actually Sterilite file folder crates that they sell for back to school).
