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I would try and find out what grade of aluminum the unibody is made out of, if it's 3000,5000 or 6000 I'd just weld it up. TIG would be best, but I pulse spray MIG 3003 .040 everyday.
I'm 100% sure it is possible to stretch an insight, but for 4 passengers you may consider going to a MKiV Jetta TDI wagon and aero modding that, yes much heavier, but not as drastic (or as cool) of mods required. That said, if you just need more cargo space, then I'd do a trailer behind insight.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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