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Regarding my front fenders, I kept the wholes large and close to the body to fill the void behind the fender. The fender is curved like the body and is is a high pressure area, both good cause for lift. After venting the front fenders I had to add a little more angle on the rear wing for high speed cornering stability. If I did it again I would (and still might) create a larger vent, same vertical size but a little wider and closer to the body.
For the running boards, I've mentioned somewhere before creating a wedge shape much like the ones on the Jeffery's race bug. Sizing them right takes some work and you can be more aggressive on a track car vs. a street car, but ideally they should be as close to the road as possible. Its common practice to use sheet metal or fiberglass moldings and rivet a rubber curtain to it.
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