Sorry but there just isn't that much to figure out. Cars have had electric motors and batteries for as long as cars have had motors (literally - early cars didn't have a combustion engine).
You take an ordinary car, bolt a big ass motor and battery to it somewhere, and you're done. Nothing innovative needs to happen and there should be no repairability compromises. If anything they should be easier to repair.
Tesla's obsession with complex body parts is inexcusable. I used to work in the car crash insurance industry - we put Tesla in the same category as Bugatti/McLaren/etc. They're that expensive to repair... and unlike those supercars, nobody is going to be willing to spend the money get a Model 3 back to show room condition.
Get yourself in a minor fender bender like the one below and your insurance company is going to buy you a new car (the owner of this car was given a $45,000 repair quote):
With a conventional car, those panels would have likely been plastic (cheap to replace) or else metal but simple designs that can be bent back into shape by someone who knows how to use a panel beating hammer. What you don't see on the photo is all the weld joints that have been stressed and failed on the Tesla. It can potentially be months of work to get that car fixed and the insurance company doesn't want to provide a hire car for all that time - so they just pay out the value of the car and leave you to buy a new one.