I do understand that the plastic base does not work for chewers. You know your rats, so you know how eager they are to escape, or if they gnaw when nervous. My guys are potatoes and don't have a nervous bone between them. I have accidentally left the cage open numerous times and my boys never go anywhere. The worst that happened was one of them stole a sock and brought it back into his cage to add to his nest.
I find it very very easy to clean. Everything wipes right off and i much prefer scooping out the deep tray than have shavings spread all over my apartment.
In short, this is the cage your rats deserve. It's spacious enough for 2-3 rats, and they will love the extra room. What's more, this is the cage you deserve. You can enjoy your pet without the hassle of the mess and cleanup.