How do you plan on using your
dinghy mostly? What type of cruising do you do?
For what it is worth, electric outboards are no more "green" then a 2 or
4 stroke outboard. So if that is your only consideration, I would stick with gas. Making a
battery is a terribly toxic proposition.
Do you have
solar? How would you charge the battery? If you have to run your
diesel to charge the battery are you saving anything?
Just things to think about.
No used 2-strokes where you live?
Parts and mechanics are easy to find for those...and easy to do yourself if you get the
service manual.