Third, and this is the part I kept having trouble with ... the diameter of the primary hull should be less than the diameter of the ring. As i continued to nudge vertices around, I kept having trouble with this rule. The ship just didn't look right when I did that. As you can see, this remains an unresolved issue.
Why? Why must it be less? I mean... as far as I know, there's no "canon" or "real science" reason that this must be the case, is there? There's only the fact that we've never seen anything otherwise... or rather, have never seen anything otherwise YET.
Make the saucer LARGER than the ring... by the "golden ratio" (going back to that). Move it a bit further forward if it interferes. Keep the saucer centered on the ring. Make the ring's length 1/"the golden ratio" of it's outside diameter.
I'd be interested to see how that looks. Just my 2cents, though... take it or leave it.