I current,y have 8 (3 grown hens, 4 3 month pullets) squeezes into one small plastic coop. I don’t know what to do about a new coop, I bought it for my flock of 4, (now at 3 adult hens 2 layers) But with the addition of my 4 pullets I’m not sure what I should do. I think your coop will fit 8 (more like seven but you could fit 8) good sized hens and like 9 silkies or bantamsNesting boxes are accessed from outside. Poop boards are kinda in an L? Here's the sketch that I did:
View attachment 2306662
In the top left corner you can see the sketch. It's to scale, with one square being 6 inches square. The poop boards are 2 feet off the ground so there is plenty of space for the chickens to be under them. There is a ramp up to the poop boards for easy access.