I am looking to build a 4x6 coop with 5 foot high front and 4 foot high back and 2 nest boxes (or should i go 3?) on the outside for 6 hens, also for the run i am useing my 10x10 with 6 foot sides dog kennel, will the 10x10 be big enough for 6 hens? Also how big of cut out for the chickens to go in and out of the coop?