Before leaving the container today, I just had time to trial fit the exhaust. This is as far as I got as it became clear that I'd have to cut the side panel (again) to get the front two pipes on.
Initial impressions are that it is a good fit and seems to line up OK with the side panel of the car, meaning that I could probably get away with a straight link pipe.
It is still in the "upgrades" plan though (for now...)