Looking at more stuff, I've gathered that a 100 ft lb trolling motor is 36v @ 50a, roughly 2.3 hp, which is a lot more powerful than the Elec Trac's drive motor and they come with pretty nice controllers. It does not look like it would be difficult to make a coupler to attach the hydro's drive shaft to a prop shaft, either. The whole power head might even tuck up inside of the tunnel, too. One might even find a configuration so compact as to hide the batteries under the hood of a 1x50 for the quietest line ever.
I'm going to have to pick my fishing buddies' brains now.
Really can't believe that nobody's put an electric motor on a Hydrostatic tractor, considering so many became donors of engines and other parts for gear drive pullers.
Replacing 125 lbs of Kohler cast iron with 250 lbs of lead battery sounds like a good thing, too.
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Grumpy old 149/1A tiller, Trusty Rusty 106, & a Massey Ferguson 10 to work the garden, Tiny Snapper to mow the lawn. Slowly accumulating attachments and quickly driving the neighbors crazy on a half acre homestead.  
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