Did some more work on the front piece and can see how much it has come down. Sitting pretty flat now when before it was 30mm-1 3/16" up in the middle.
Just drops into the gutter now.
Close up of the centre bead I hammered in by hand.
Now to join the front and sides. Need to stretch and reduce the radius slightly at the ends to raise it so it doesn't dip in the middle.
Still has the wedge shape to it even after I have reduced the front by 25mm-1" and the rear by 40mm-1.5".
Just need to weld the front corners up and do the final shaping and planishing before the centre goes on.
Not sure if to fully spot weld the perimeter on before welding the centre infill panel in, or just heavily clamp it and weld it there so it can be taken down to dress the welds afterwards? Don't want it to change shape at all where it fits into the gutter after all this work is my main concern.