Thanks, Forbin! 
Naaah, BolianAuthor's got it just about right (c.f. my model). If the saucer curved all the way to the very edge you'd be right, but... there's a flat area on the outer ~1/3 of the saucer which complicates things.
My only suggestion would be to have the lower end of that curved line intersect the horizontal of the saucer at a shallower angle. But it's just a small matter.

Okay... a small update. I also finally included the curvature for the saucer/shelf, so let me know if it looks right.
http://img828.imageshack.us/img828/2049/curvature.gif
The bottom point of that curved line should hit right where the side angles up for the "miranda shelf"...the top starting point looks correct, just "stretch" the curve down and back until it hits the angle point. Another way to think about that line, it's simply a foreshortened (horizontally-shrunk) copy of the top saucer profile-well, flipped of course
Looking good![]()
Naaah, BolianAuthor's got it just about right (c.f. my model). If the saucer curved all the way to the very edge you'd be right, but... there's a flat area on the outer ~1/3 of the saucer which complicates things.

My only suggestion would be to have the lower end of that curved line intersect the horizontal of the saucer at a shallower angle. But it's just a small matter.