Not sure if I want square barrels... Might fit the Imperial aesthetic a bit more, but I tend to go more conventional. Can always try how it looks.
The gun barrel only elevates, as the entire thing building turns, so I think I'll extend the inner "window" up and down to the two ledges, so as to better portray the scope of movement. Might also lower the middle ledge, so as to further exaggerate this.
The arches should remain vertical. as this is a key feature of the design. The roof will probably be a dome at this point, due to the roof shape now. Had things progressed slightly differently, it would have been A-shaped roof sections stretching back from each arch to a central point.
Been stuck on a course for a week (they didn't warn us about this, sounded like a one-day course), so progress will be slow. The printer has also replied to say that he is not able to do anything over the next couple of weeks, which includes feedback on my submitted part.