In the previous article TomW suggested a paddlewheel design much like a sidewheeler boat and disguising the device as a jetty to avoid legal issues.
Seems to me that an even better approach would be to put in a dock or a permanent anchorage (a bouy with a big concrete anchor - and in this case an underwater cable tied to the bouy, too), and build the turbine AS an electric sidewheel boat. Put an auxiliary generator and some of your batteries in the boat, some of your batteries in the house.
Most of the time the boat is tied up facing upriver and generating power, keeping all the batteries charged. Occasionally you unhook it and take it for a cruise, or trolling for fish, with both the house and the boat running on their respective part of your battery bank. If you run it out of battery power in the boat you can always start the auxiliary generator to get yourself back home. (That's why it has the aux generator in the first place. B-) )
You WILL need a big motor, though, (or maybe a big aux outboard) so you can drive it against the river's current and not get sucked out to an ocean.
The only difference between this and a "real" boat-only boat is that the paddle wheels turn when it's at dock, too.
You get regulated as a dock and a pleasure boat (or a pleasure boat and a permanent mooring) and don't have to deal with environmental regulations designed for dams and big power companies.