Engine skid and a tummy tuck would help on the under belly
For the bumper to fender area, you might want to see if you can score a set of the export milk jugs. They cover that gap pretty well
For an underdeflector thing, I fabbed up this for mine
Its going to get the acid test over the next couple of days, need to drive from the Bay Area to LA so its going to see a good few hundred miles of highway.