Hey guys! We are thinking about expanding our guinea pig family and therefore their cage as well. Their cage is 2?4 and we currently have 2 piggies. The cage sits on top of a desk and we were thinking of pulling the desk out from the wall a little bit and making a long ramp that runs behind it to another 2?4 cage on the bottom. So my question is, what should we make the ramp out of and how? Weve seen a lot of wooden ramps but are afraid of the piggies peeing on it and it seeping in and smelling so what else could we make it out of? We also dont want it to be slippery so we dont want to use coroplast. Any suggestions?