Coop box input wanted

[FireFlower4]

I have begun construction of an A frame moveable coop. It is 10'L x 6'W x 5'H.
I was thinking of making the coop box 4'L x 44"W x 27" at peak... I will be housing 6 birds. What are your thoughts on the box size?

 

[Ameraucanas]

I really don't have a lot of experience in coop construction, but good luck!
-Ameraucanas