To do a professional job, there are a few more things to consider. There's cooling for various components and the small matter of balancing the cells if using Li-Ion batteries. Smooth speed control is not simple as it is dependent on the spec of the motor used. I'm told that Tesla motors, whilst powerful are a bit on or off!!!
...but a bit like with ICE cars, you can get groups of components already lumped together so it isn't as hard as it might first seem. When you do a normal engine swap, you don't start buying the pistons , block, cylinder head etc separately.
I think for the electric Z300S it is something like a Leaf motor, Mitsubishi controller and something else for the batteries.
I am sure we will be playing with this stuff 2nd hand in the not too distant future. I have a crap Nissan Leaf which I might nick the motors and controllers from, get a new battery and see what is around to stick that lot into. Not yet, but not too far away.
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