Currently our coop is 6x5
Tight quarters for 16 birds.....even 13 is tight.I am almost positive that 3 of the babies are cockerels (there are 8 total) - I am working on finding homes for them maybe with the exception of the blue buff orpington. We already have 1 rooster who is 5 months (cuckoo marans) and is super sweet, also we have 7 hens who are 5 months.
As far as integration, might just let them all range and see what happens.
Maybe let the olders and younger range on alternate days,
so the youngers can get the lay of the land without being harassed bu the olders.
Tho 6 weeks is kind of young to range.
They'll sleep in separate coops for now.