Ramps Good ramp idea??

So you want the ramp to be elevated with a tunnel under it? I have a 2x4 with a loft. My ramp is 2 bent grids, a strip of coroplast, and some rubber bath matting on it. To make it less steep I have a brick under the bottom. The girls get up it fine.

Maybe if you want a tunnel, you can take a bent grid and cover it so they can still jump on it?

See this ramp in the gallery.
Easy Ramps, #04 - Guinea Pig Cage Photos

I saw a ramp that was made out of a large pvc pipe cut in half, I thought it was a really good idea. I made mine out of a wire drawer organizer that I found at Dollar Tree. I cut the ends to open it up and covered it with a rug sample. I have also heard people say they use 40 grit sandpaper to cover their ramps. It's supposed to help file nails but isn't scratchy enough to harm foot pads.