New run-- need help with coop design

Okay, this is the perticulars. 10 chickens- 9 hens -1 rooster. 600 square feet of run 20'X30'. Now here's where it gets a little fun. 600 sq. ft divided into 3 equal 200 sq. ft (10X20) areas. Idea is to alternately graze the chickens in each area in it's turn. This is to attempt to keep rye, bermuda grass and turnip greens, rape and mustard, vegetables growing for the chickens.

The two of the grazing areas are parallel to each other with one area stretching across the top of the other 2. I would like to centrally locate the coop at the common junction with maybe a chicken door to each area. One man door accessed from one area. the other two grazing areas can be accessed via internal gates.

Some of the features I would like are egg nest with hinged top so I can pick eggs without entry to the coop. Size 4X8 with a peeked roof.

One other thing. I am down to a couple hundred dollars left in the budget so I'll have to keep material list short and simple. On hand I have a few 8' treated 4x4s a couple 3 treated 8' 2x4s, a couple 2x6x12s some ply wood scraps, nails, screws, cement blocks, and about 10 sheets of 10' galv corregated metal roofing.

Plan is to think up a good coop design before putting any money into it. The chickens have the tractor they are presently in to use until coop is built. The chickens will not be going into the new run for a couple weeks yet. The run is built, and secured with electric fence. Waiting on grazing grass and veggies to grow out.

Hopefully I can get some pictures for ideas. Kinda hoping to build an Acadian cabin look alike deal.