Very impressive work Fleetfoot!

I ran into a similar challenge when I made this mesh:

http://moi3d.com/forum/index.php?webtag=MOI&msg=4561.1

Congratulations on coming so far so quickly with MoI. You'll have lots more fun with it as you increase your skill with it. Since you have Rhino experience, it should be as easy as going from a rugged mountain bike to a 10-speed... a sleek Italian 10-speed made with wind-resistant, lightweight composite alloys! (okay, poor analogy. ;-)