.. done the math... no, I have not...
Relieved to hear about the solid battery bank. Maybe I am a bit hung up in the numbers, but hulls, motorisation and propellers are hot topics in most marinas; and quite difficult unless you buy a standard package. And energy supply is relevant to SH3D and modern house-plans, even more so after this cold winter and hot summer...so many calm waterways with almost no current in Europe that most of your fears would disapear if you would experience them....
Oh, but I am relatively familiar with the inland waterways of Europe. Only not as crew (except on quiet canals in Holland and once in strong currents in the Orwell estuary). But I have sipped G&Ts on deck on quite a few canal- and riverboats. A family tradition started on the Nile many years ago 
. Hardly enough for an opinion on navigating waterways such as the Rhône, Donau which apparently can have currents of as much as 5 knots. But I have been curious after experiencing underpowered (displacement) boats in strong currents and wind. All in favour of trying the impossible, and I really hope you get to realise your dream. But still think some maths, carefully assessing test results and expert opinions, a touch of caution and lots of reserve horsepower is good. A bit like SH3D house design in general. While amateurs can have brilliant ideas, create great designs and custom solutions, it is high-risk to try and build structures without professional advice.
ok
