If they have a properly automated production line, then varying battery sizes and 2-3 additional drivetrain variation should be a non-issue.
If the production line is NOT automated (which seams to be the case), then Tesla will pick a single easiest-to-build configuration and push it out the door to meet launch deadlines.
It is weird that they hadn't settled on that single configuration (if hearsay reports are true, but who knows if they are), but the again, everything about CT has been late by an order of years.
Or it could be as simple as they got new manager in charge of the roll-out who has no clue what he/she is doing, so they sent out a form to figure things out.
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