Normal
No going back now! Sorry about the poor pic. I laid on some masking tape and put some datum points at the top and bottom of the screen hole. As I suspected, the heights of the windscreen ledge varied from one side to the other. The offside was 5mm higher than the nearside. The screen was a good fit in the middle, so it looks like I need to put the new panel on 2.5mm higher on the nearside and the corresponding amount lower on the offside. I'll be triple checking the fit before final welding as well.