A small island is a great place for a vehicle with limited range. How fast and how far you want to be able to go? The lower you set your specifications, the cheaper it will be. If you decide your car will stay off the expressways and never cross the bridges, you might find you can complete the conversion on a very small budget.
As to the tutorials being confusing, well, they should be. This is not a trivial project that you're proposing.
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