I have now begun the 'dreaded' doors. It is true the pilot holes that are meant to line up for fitting just don't when it comes to the ones at the top section of the window. They are out by approx 3/8-1/4".
Taking my lead from those who have trod before me, I focused on the left, right and bottom door gaps and the base level holes. These combined with the tight fitting to the roof line lead me to believe that the doors shold come together well.
I still need to do quite a bit of wrok, however they look very promising.