Welcome back, Kitt.
Sounds fun to be making it the subject of a school project. I like the 5 sets of drivers idea.
Are you planning to make it a "blind" test? You could theoretically lead the driver to the car literally blindfolded, so they're not able to see whether they're about to drive the modded or un-modded version. (You'd have to mask the top of the rear window to hide the presense of the partial Kammback). It'd improve the validity of the experiment. Just a thought.
As for drilling into the car, I hear you. I also did not want to drill into my car's wheel arches to attach the skirts.
So I made these little brackets:
from:
http://ecomodder.com/forum/showthrea...metro-103.html
I used the mud flap as an attachment point for the aft end of the skirt.
Keep us posted! I hope you'll share your project report with us.