Beware that the flags on the top view are confusing: the CAD, game video, and iso views of the field in the manual show the Red Secret Passage and Red Flag on the same side of the field as each other, not opposite sides like the top view.
The best explanation I've seen is that each tower has two flags (1 red, 1 blue), and the active one is vertical. So a tower that starts out Red will have a vertical red flag (which isn't visible from the top) and a horizontal Blue one (which IS visible from the top view).
Also, you can download a STEP file of the field from this thread and open it in CAD.
http://www.chiefdelphi.com/forums/sh...d.php?t=141138