So, I mocked up and cutout the panels for the under-cabin section of the car. I cut the plastic a little big so I can make the final trimming accurately with these on the car. Going to try for getting within 1-2" of the exhaust. I will have to check back after installing to see if there is any heat warping going on.
Here is the cardboard mockups:
And the ABS Panels cut out.
Once I figure out how I wills secure these, I'll get some pics on the car.
Also, not that this really matters much, but the ABS panels I've been buying come with a textured side and a smooth side. I've been placing the textured side face DOWN, with the assumption that the "golf ball principle" will help to reduce drag on the textured side more than the smooth side.
"Phase 3" will be the panels under the trunk area.