that picture of the 6 has been taken at a good angle.
ive seen a few of these conversions. they look like hell, nasty things.
just like that e21 cabriolet posted a few months back.(the baur version was bad also)
there couldnt have been a market for a large cabriolet back in those days. the 8 series was also never made into a cab, but again there was some nasty conversions on the go.