I sometimes contract with a bus conversion company, they take old bluebird city buses from the 80s and either convert them fully electric or hybrid diesel. (My job is regarding installing and working out the canbus network on them)
As they are owners of the whole conversion, they offer that as a turnkey solution and provide complete support for them just as you would expect.
This is quite easy to do on a bus/truck level as the buses are terminated and maintained at depots, their drivers are trained for it and so are their mechanics while the depot is equipped with additional assemblies for the electromotive unit, the rest of the bus is the usual chassis with air ride suspension, 120,000 btu ac units, US DOT required brakes. hydraulic steer axle etc and a usual 24v setup throughout. Its a literal dealership level setup but at the bus depot and parts supplies are all certified with proven and industry standard design.
My point is
If you cannot provide full aftersales support for it and cannot prove that its equally usable and safe to do, its a hobby/diy/kit car level idea. Have you seen an average car owner in Pakistan own and maintain a kit car.
Lets take a single widow with 2 young schoolgoing children who works in a bank owning an older car. if she has it converted with that kit, how do you expect she gets it going back on road after failure? Call tow truck? Ask generic mechanic for help.
Then the cost and time of charging?
Now coming to manufacture of batteries, what would be the source of materials? Do solid state battery manufacturers pre exist? Scrap?
