It's a good prototype. What she needs to do to make it viable is automate it:<p>1) The flush crank needs to be automatic or at least push button. The energy from the device could power the flush.<p>2) It needs to be able to output its energy back into the house easily. I think it's a solved problem -- sort of like solar panels.<p>Once that works, I don't see an issue with sprucing up the visual design a bit and making it all work. There are a couple of issues, but if it's cheap and sanitary it could catch on.