yes, i think that's what i was trying to avoid, was having to clean the entire setup between hamsters. i would probably just put paper towels down for them. i'm going to design it so that each bin has a 'door' in one side, on the ends. i'm going to use the bits of fence from a Joy rodent enclosure to make the doors. I'm not sure what i will use for a latch yet.
then i can just open the door to each floor, stick my hand in and do a spot clean.