Two issues I have that go hand in hand are what will be clearance to the ground and how to protect it. Height I'll have to figure out when I have my car at the correct ride height. Protection may come from a sheet of HDPE secured to the bottom, acting as a skid plate. Its pretty slipery stuff.
The whole thing is mushrooming as I just thought, I'll probably have to do something on the back too, although I do like the drilled apron look I've seen on some of the euro cars.
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