My coop is 5ft x 8 foot wide (not including the run). 4"x4" posts in the 4 corners then the frame was created with 2 x4 and 2x6" lumber. 2 middle boards of 2x4" to secure the bottom to hold the flooring.
Frame was attached to the posts *4x4 posts). ply wood is the outter boards inter locking...