[MENTION=1561]Samantha[/MENTION] - I love that! I might have to try something like that in the future. Our sofa is up against the front, so we would probably still need some sort of lip, but I hate that we can't see them. Especially our little one, she usually climbs up and sits on the back side of the sofa so she can see them.
On the flip side, Bella and Layla are so cute when their heads unexpectedly pop up over the coroplast to investigate.
We have the high side in the back, but somebody still launched pee on the wall behind it. There's an oil painting on that wall and pee dots reach up to the frame (about 4" above the grids. Yikes, not my painting! If there were guinea pig olympics, there could be a sport - pee shooting. LOL.