Returning to the subject of the wheelhouse, I think that when Vic drew the plans, he simplified the shape. This is just a personal opinion, but when I built my Guardsman, I had a long look at the picture of the Enterprise, enlarging the wheelhouse, and decided It wasn't rectangular, as on the plan. To me it seems to be a hexagon, with 2 angled panels between the sides and the front, one of which is the door. Looking at the roofline seems to confirm this, and it would make more sense and be more practical.
Of course, I might be completely wrong, and have misunderstood the picture, but it's how I built mine.
Charles.