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One benefit of the tape is that it has a really low profile. It doesn't add any protrusions to the surface of the car.
I was up late reading this site one night and I had found a big roll of duct tape earlier in the afternoon. I applied all the tape to the car within an hour or so in the garage with a flashlight at around 3AM, using a washcloth and a bucket of hot water to wipe any dust or dirt off the car that could have affected the tape's adhesion.
The front wheel skirts are complicated. Look at the third image from the first post in this thread. It shows the partial front wheel skirt. Notice the notch in the skirt's lower edge about halfway along it's length. That notch is from the front tire rubbing against the skirt when some set of conditions are present, perhaps accelerating around a turn while going over a bump.
So if you are going to install front wheel skirts you'll have to figure out the full range of motion of your front wheels to get the size just right, especially if you're using coroplast, which could easily melt. Or you could build a flexible skirt which would work better anyway.
I only know how much of an improvement there seemed to be with all the duct tape on at once. Reducing airflow in and around the wheel wells is always a good thing, so go for it anyway and if you do just the front ones please tell us your results.
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