tesla model s chassi

I recently noticed some of the the coverings of the bottom side rails peeling off. They seem to cover and protect steel railings of the chassis. I have removed them and am planning on cleaning the rails with a scotch pad and painting over them with POR, but would like to replace the plastic like...

This is a bit more than 'just' a conversion... Anyways... There still doesn't exist one single decent production EV Station wagon on this planet(!) The only ones that do exist are a few custom builds. And once this one is finished there will be one more EV Station wagon unicorn... The guy...