Its a great idea, what a shame like most hamster related things, it isnt a bit bigger! I have some small water bottles that look like they would fit though, same width as the classic, but two third height.
I like the little log house too - we had one similar, and whereas my hams never seem to touch the wood chews, Spud 'remodelled' his wood house until it was unrecognisable!
Now I wonder what Big D will choose for his new baby? I will be keeping you informed about a certain future litter if he hasnt chosen by then