That is a really cute design! Though I think people that have chicken coops with ramps also have much smarter chickens than I do XD We have a nesting box that has a ramp up (not our design, we inherited it with the house, I would have done it very differently) and the adult chickens will often just jump up (not that high for them) but any chicks that we've had just run around the bottom like idiots panicking because they can't get up. Sometimes they learn how to use the ramp and more often their mum just ends up jumping down and roosting on the floor with them.