I’ve decided to go with a frost protected shallow foundation. Here are a few links specifically for Michigan:

Frost Protected Shallow Foundation Code specifying changes.

Climactic data for Frost Protected Shallow Foundations

Frost Protected Shallow Foundations – info from ICC – I want my foundation to be as well designed as possible.

Revised Builders Guide to Frost Protected Shallow Foundations.

This article describes that unheated and heated areas of a house are treated differently. Interesting. I wonder how much that styrofoam insulation is??