3 sided design, is it ok?

We just built a new coop. It is 8Wx16Lx8H , this is attached on the left side to a pre existing coop. The front of the new coop & 8ft.,down the right side is a heavy gauge chick wire. The back 8ft on that side is closed in. The very back of the coop is also closed in, with a lift door on the top half.
So when you are standing in the front looking in,you are looking thru the wire and it is open all the way to the back wall. The roosts are all the way in the rear by the screened in lift door area.
We have a seperate room in the existing coop for our laying room which has access to the newly designed area.
My question here is , Should we add a wall in the middle of the new coop to close in the roosing area, or will it be okay left open ? Most of our weather here comes from the backside, so the rain and should not get the roosting area wet. Also, the runs we have are not covered, so the front half of this design will serve as a small 8x8 covered run for them when needed. Well........ any opinions out there ?
Sorry printer is not working , so no pics !