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I have a Suzuki Swift which I converted to electric.
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Pics?
The general rule seems to be match the airdam to the lowest point of the undercarriage. In your case 2". I would exclude any small protrusions—for instance on my car a tow hook is 1 1/2" lower than anything else.
There's another side to the coin: You'll have about 6" in clearance (measured in metric of course
). Depending on traffic controls, curb cuts, gravel roads, potholes & etc., you may be able to get by with less. I find 3" is comfortable.
A flat airdam only needs a radius on each end equal to 4% of the width. The further forward of the axle centerline, the more it will drag on approach ramps. The further back from the bumper, the less effective.
I think you picked a good body to work with. Opportunities would include air curtaining the front wheelwells, skirting the rear wheelwells, boat tailing and adding a divergent duct to the lower rear.