Sen has a waterbowl in her ZZ2 coz she started to chew the whole (which is taped over with duct tape atm, until I get a nut and bolt for it). It's so cute to watch her drink out of it!
Only problem is that it needs to be on a shelf, or she kicks substrate into it.
The only thing I'd worry about not meshing is that my Sen can climb out from the top of her house/bridge (which if Marshmallow was to kick dirt up and prop the cardboard house up a bit, would allow her to reach). And if she manages to get her wheel jammed (by kicking substrate under it or behind it) then she can climb her wheel.
I'm sure she'll be happy in there though.