There's an example of how to do a hand in a polygon sub-d modeling program here:
http://arl.cs.washington.edu/tutorials/handtut/handtutorial.htm

and if you search for something like "sub-d hand modeling" you can find others, here's one for Blender:
https://www.youtube.com/watch?v=azaFLq9CNzA

You can kind of get an idea from those how you would form a blocky outer hull formed of all 4-sided polygons and then subdivision smoothing blends all those together.

Sub-d modeling programs are specifically focused on constructing organic shapes with this technique unlike MoI.

- Michael