I think the F07 is quite ok from a design perspective, even without mods. The only "real" issue IMO is the windscreen angle. See pics of my car attached.
The sad part of the 6GT is that BMW abandoned all features that made the F07 unique; the trunk lid, the seclusion of luggage, the special interior and door panels. Good thing is that they added full air suspension and unbroken rear side glazing.
I still believe the F07 to be the perfect mix of autobahn/alps/city/rural/cross-continent vehicle.
/M
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