I built my "bantam condos" about a decade ago to fit into six 8' by 12' pens that I had. I tore down the pens and am incorporating the condos (coops) into smaller 4' by 10' moveable pens. They could be considered chicken tractors (arks) with the addition of wheels, skids or some means of easily moving them around. All the lumber is treated and I'm reusing as much of the old lumber from the pens that came down as possible. Here again I've included steel roofing to keep the birds dry.
They should have vents near the top of each to let the heat out, if used in the hot summer months or leave the doors open and cover the openings with wire as I do. I don't have any plans drawn. They are made of treated lumber, using 4 by 8 sheets of plywood, 2 by 4s, miscellaneous lumber for framing on the inside and coated screws. I used clear acrylic trimmed with a vinyl siding channel to let some light in on the East, West and South sides. Each unit has a Fowl Stuff nest box. Also each unit has two roosts and a rabbit style feeder inside. I keep the water outside the coops - in the pens. I use wood shavings, in stead of straw, for bedding and it is very easy to scoop out for cleaning. A light has been installed in each unit that works off a timer to increase egg production.
The outside piece, with the door in it, is 4' by 54" high. The doors are 17" by 28" and centered.
The inside piece is the left over plywood from the other side, so it is 4' by 42".
The side pieces are 24" wide by 54" on one side and 42" on the other. This means the outside (total) width of the sides is 25" when you add in the 1/2" plywood of the front and back pieces to the side piece dimension.
The total width of the front and back is 48" - the width of the plywood.
There is very little material waste, if figured properly.
Let me know if you need more info.
The first photo is of the old pens and then 3 shots of the first of the new ones.