It is still very difficult to set the convergence for each separate gun on nose mounted planes. Choose a Mossie and try to set each gun. The view is from so far back it is difficult to grab individual lines.
On a side note...the grids in the windows of the towers seem to be very wide. It is hard to get a good look around because the grids in the windows take up a lot of view without trying to physically move your character outside of the windows in each direction.