Changing the Frame>Rough Opening dimensions in addition to the 0 thickness insulation air gap gets me pretty darn close. I wasn't fully seeing the how things corresponded because I had my filled polyline boxes in the way! Image 9 shows what I was hoping to get to as a starting point, looks good! Image 10 is now that I'm starting to add some of the flashing details. I'll have to do some blank boxes where the drywall and siding stick up but that should be manageable.
On a separate note. I'm trying to increase the thickness of the polyline I'm using to represent the flashing. I've moved the 'weight' value all over but don't see any change. Does that only work when you actually print?
TMD1580's post in Window Cross Section Detail was marked as the answer