Very interested in your project. This is exactly what I would do if I had an extra 5 hours a week, but I'd use a Kawasaki Ninja 650 or better yet 250, just cause I like 'em. Your SV will do quite well anyway but be sure to address gearing and cam timing to optimize the engine efficiency at higher speeds. Doing this alone should net you 65mpg+ in current form.
I think the project you and Craig Vetter are undertaking have great potential. Not sure why Craig isn't getting the mileage he should. Something tells me the Helix 250 drivetrain, though capable, is not optimized for highway speeds.
Good luck and go forward with this. Blaze the trail for all of us that want to do it someday. We'll be watching...
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Good design is simple. Getting there isn't.
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