Help with selecting a motor for ev smart car

Hello

Im seriously concidering doing an ev smart car, if its suitable, or other small car ie can fit a motor into it and attach it to the gearbox easerly, pretty sure i could knock up an adaptor plate to mate them together, seen a few done.

Think i can do the cell, and inverter but unsure on how big in kw motor shlould be? and size on inverter to use? Or even best voltage to aim for

Wonder if someone coild point me in the right direction or help me selecting right size motor that would be suitable, am i right in thinking 3 phase motors are used, lr a specific type of 3 phase motors.

Cell no problem, using 18650s, know someone who has a big pile of them.

Was thinking of a 12s battery? Is this the best option / voltage?, but unsure what i inverter to use ie kwS

Or maby someone has seen a build where i could get some info from, or should i just stick to my e skateboard?

Thanks

Where you from?
In the EU i know 2 dealers that are selling complete diy kits from small car to vans, but your are limited in there offer.
Mostly VW and Citroen.