I don't have any pictures yet (right now Cozy Boat #2 is installed in the big cage for Cera's comfort), but once she's on the mend I'll put it back into the travel cage and take a few pictures, so you can see how well the Cozy Boat fits into it (for vet trips and travel I use a Living World hamster starter cage that's blue/red/yellow, or a Super Pet mouse starter cage that comes in teal or purple).
I have to say Cozy Boats have found a new calling - as the best possible lining for travel cages or vet cages. They cover about 90% of the floor of the Living World cage that I took to the vet, and the girls had excellent options for traveling: if they wanted to be cool and/or watch the world go by, they would sit on top of the cube part. If they wanted to be warm or hide from the world, they would just enter the cube. It was very nice and cushy for them, which was of especial value after Cera had her tooth-fixing procedure done. She just found a fold in the flat and gently wedged her whole body there - so the car's motions didn't move her, and she was snuggly and secure.