I'm curious, the SE shot of Vader's shuttle flying toward the executor, could that not be used as Needa's shuttle flying over instead? Keep the shot, change the context?
Also, for the perspective issue, if you extend all three perspective lines on Monrovilles diagram you'll find that they all meet at the same place, i.e. the vanishing point is the same. This means the perspective is actually correct, it just appears off (as he pointed out later, likely an optical illusion)