I don't have plans for mine, but it's a simple 8x10, designed for 20 meat guineas (kinda small once I had a sick one in a kennel in there). I started slaughtering them around 13 weeks, which helped make it roomier.
Basically: 4x4s for the bottom and a sand floor. 2x4 support beams to hold the plywood walls. The roof sloped from 8' at the front to 6' at the back, and I made the roof simple and vented. Once the walls were framed I (my uncle really) laid the 2x4 rafters so they were sitting on the wall frame, then he put more plywood on that and some roofing paper. This gave a nearly 4" gap at the top. 1 glass window, 1 big door, and 1 side window (I'll be adding another back window later).
Pic is in that 'my coop is too friggen blue' post...