Find perimeter and count features

I need to find the perimeter length of parts.  I also need to count how many internal features on a selected face - regardless of size.

The parts are made from sheet stock and shouldn't have thickness issues.

These come in as STEP files and won't have much intelligence to them.

I will select the face to use for the perimeter as well as faces for counting features.  I don't need the feature perimeter, size, or type.

Examples:

The perimeter of this face is 25.743.  The number of features is 1.

The perimeter of this face is 19.725.  The number of features is 0.