More progress on the underside today, 2 more panels added on.
This area of the underside already had some aerodynamic panels on it, but it still had plenty of room for improvement.
New rear wheel spats! The new undertray panels presented a flat surface for me to mount spats to. My previous spats were pretty bad, Never tried them out because they didn't look beneficial. Mounting the spats required machining L brackets, including drilling new holes and cutting off excess material. Just eyeballing them, I think the spats are mounted too far away from the wheel, looks like they should be an inch closer.
I have driven the car with one panel on it, and no rear wheel spats, haven't noticed a clear improvement. With two panels and the rear wheel spats in place I expect to notice an improvement on my next drive.