Hello, Nearly all my walls are up on the 3 tier coop! Next I'm cutting the holes in the floor to attatch the ramps on to, to get to the lower level. I'm not sure how big to cut them. There isnt much floor space so ideally they'd be as small as possible. I'm getting Miniature bantam Silkies, but want the hole to be big enough so that regular bantam Silkies can use it. I've not kept chickens before, so if anyone could give me a rogh guide I'd be really grateful. Thankyou.