Thanks Ian - good assessment. That extra width is a bit of an issue for folks like me with 1930s garages. I wonder if they tried the side radiators further back behind the front wheels on lock, which might have enabled a slimmer track... although that may have compromised the side blade luggage system...
Next: I wonder how much the bevel box upgrade will be for M3W5sps (and what will we abbreviate Super 3s to... MS3? )