I'm designing my coop layout and want to mount the next boxes inside the coop and up high enough that the floor space underneath them is usable. I'm planning on having a 1x4 in front of the boxes to land on but wasn't sure if I'd need to install a ladder if that was up, say, 24" from the floor? Most of the flock will be medium but I want a couple of Sussex and Marans in the mix and certainly don't want any eggs on the floor!