Why stretch a car at all and end up with goofy proportions? Use a wagon as a base and simply fabricate rear seat mounts that are further back. There's that step up in the floorboard back there to deal with, but if that actually proves a problem, you could potentially leave it as-is by giving the car some luxury reclined seats like a Maybach or something that lay out over the step. The rear window is still way too far back for head room to be an issue.
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