chippwalters,
If you use Samardac Bridges you can model in NVil and then convert to MoI in one click. Great solution to solve organic stuff modeling with MoI.
A lot of people starting to use this approach, for example yesterday I got this message:

"Now I've exported SAMARADAC SPOON from NVIL via SAMARDAC Bridges and exported SAMARDAC SPOON from MOI as an .stl file and loaded it into Cura. Tomorrow I'll print it.
My (beginners version) of your spoon was created by following your tutorial which I've managed to follow having 'done' a bunch of your introductory tutorials.
I think that it's hard to get started in NVIL but I believe the it will be worth the effort.
I should mention that I've been using, from the start, the SAMARDAC Configuration!" (By mgg942)

PS
Forget to say, you have to use no less then this version of NVil to use with new config:
http://www.digitalfossils.com/Download/NVil-Apr-21-15.rar