Here are pix of the 4 sizes I'm calculating for.
Give me your gut reaction: Which size do you like better?
Scenario 1 - Small: The top bulge is one deck tall. This is the size indicated by the blueprints linked to earlier.
Scenario 2 - Medium: The lip of the main hull is the same height as the lip of the Constitution's saucer --about two decks.
Scenario 3 - Large: The breadth of her main hull is about same as the diameter of a Constitution's saucer. This seems to be the size most often quoted.
Scenario 4 - Extra Large: The length of the nacelles are the same as the length of the nacelles of the Constitution.