To point 5: there are companies that sell electric crate motors, pre-configured to couple with your transmission's bell housing. Hell, some of these companies sell the entire conversation kit, or will do the entire conversation for you. These conversions give you a completely offline electric car that keeps an older car from going to a junkyard, and reduces the materials needed for an updated car on the road. Also, if someone is concerned that a new electric car has the same carbon footprint as an internal combustion vehicle, recycled and reclaimed batteries are an incredible option.

If you're going to do one of these conversions on a standard transmission car, you'll probably want to pay some professionals anyway to tune it so that you don't shred your clutch when you shift. I almost did this with my old '95 Explorer, but it had some suspension issues that I wasn't willing to tackle at the same time. Plus, my neighbor told me that one of his friends had their car destroyed in a flood, but talked about how they always wanted a classic Explorer in exactly my color, so I gave it to her.