Domore, I just got quail myself. I wanted a low cost coop for now until I had a better idea that would suite me. Drove around on trash day and made 2 temporary quail tractors. One out of a old kitchen cabinet that has an open backside on the ground, when I open the doors I just put wire netting...
My 6 Peking ducks have been temporally in and out of my chicken run with my 7 barred rocks. They never enter the coop to sleep, but sometimes they will walk 100+ yards from the pond they usually live in to the run were the chicken food is, gobble it up then sleep there. As to answer your...
I would agree with splitting the larger brids from the smaller birds for a little while until they grow a little more. Recently got 40+ tex a&m and suffered 2 drowning trampling deaths. The brooder sold me 2 batchs that were only supposed to be one week apart in age.