I'm very new at this. I have two 4 wk old chickens and six babies coming next week. I will not be putting them together for a while, but I wanted to know if a run 12x12 will be large enough? I was going to have it made larger in a L shape, but after pricing welded wire and hardware mesh today I decided to have it made smaller. I thought I would put 1/2" hardware mesh along the bottom but I'm not sure what size welded wire for sides and top. It has to be 7 1/2' - 8' high because of shed door. I'm going to have windows cut in the shed (old shed my husband had built years ago) Should I put 1/4" or 1/2" hardware mesh on windows? Also the shed has a brick floor. Would it me best to put plywood on top of the brick?