Done properly, lawn edging doesn't look bad at all. It can almost appear to be OEM quality from 10-15 feet away.
Belly pan, go cheap. Nobody's going to see it, and the more work you put into it, the more you'll be irritated when it gets damaged from road debris.
A rear air dam isn't necessary. You'll be better off just connecting the rear section of the belly pan to the lower lip of the rear bumper. Since there's a chance people will see this part, you can make it from a sheet of ABS or black coroplast, or if you can find an aluminum sheet, that will also work.
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