Our coop is about 50% built and I will be cutting out the windows and pop door tomorrow morning. My question is, what the the shortest ramp I can use up to the pop door if the bottom of door is about 3 feet off the ground. We are making the coop tall to save our backs when cleaning. And while I am asking, what is the minimum width of the ramp? I am planning on a pop door that's 10"x15". Don't have our chickens yet, we'll pick them up from a neighbor when the coop is built, but I believe we will end up with RIR's or something very similar in size. And yes, we are taking lots of pictures of this amatuer building project Thanks for your help!