1 - Yes.

2 - Seems like it was $100 or more. Dunno what is involved with the install, wasn't hard as I recall. BUT: Not worth it, IMO - it only put out a small amount of current, more like a trickle charge, not like a house bank recharge amount. To get the full amount of current (which was like only 2 amps) you would have to run full throttle or near it. When motoring, I don't run the engine that hard very often, it's not needed.

3 - I made good 1/4 gal per hour running from Wilmington to here, almost nonstop (3 hrs sleep in 34 hours total trip time), including some hellacious wind on the nose, and 2-4' seas on the Cape Fear River from Swans Cut to Southport - wuzzat, 10 miles, two+ hours easy? I think 2 strokes have more low end torque, but at 'cruising speed' I don't think there is that much difference.

4 - Mines been great. I think in all except for very steep pitching seas, a short shaft would be OK as far as cavitation.

Price - a big guess - 25-30% off? Maybe a little more?