Here's a diagram (not necessarily proportional!) I just drew up of the aero panels under the front:
Engine is marked in dark green, transmission in light green, drain hole in purple.
Panel #1 is a rubber panel to absorb impacts/scrapes that slopes down to #4, which is aluminum and seems to provide a rigid support for the others. #2 and #3 have air deflectors in front of the tires and are a flexible rubber. #5 and #6 are black plastic and run from the the aluminum panel back to a cross bar.
Below is the best view I can get of mine with the panels in place. I have replaced panel #2 with coroplast.
