Hi Pip,
Indeed, the swing axle is a limiting factor, though I pushed the boundaries by quite a lot by stiffening the suspension and linkages, and by improving the weight distribution. I considered fitting a W124 rear end, as it has already been done on W111s. But this requires modifying the shell of the car, when none of my modifications did (all are reversible and the car can be put back to original if someone wishes so one day). And hey, the 300 SL Gullwing, the first supercar ever made, has exactly the same problem. So why being more catholic than the pope? I just need to adopt the same driving style which consists of always being on the gas pedal in corners, and never lift it in the middle of it.
Indeed I love planes. Years ago, I happened to pilot a plane for two hours over Tanzania in particular circumstances. Luckily the pilot recovered sufficiently to land the plane. This motivated me even more to pass a licence, which I still have to do. Colin, alias Stickandrudderman on this board, flies vintage planes.
Urban, I doubt you can have a front wheel fully turned outwards and its suspension fully compressed in normal driving circumstances. And if you do, I bet the rubbing will be the least of your concerns! To reach such a situation, I backed a rear wheel on a steep ramp and then steered the opposite front wheel outwards to the maximum.