Cd, that's a great find! the-blueprints.com seems like a good source, especially for doing the template.
OP, notice the pic that Cd posted shows the low hanging stuff on the bottom of the car? You can see it in the profile shot and especially in the front on look. If you can clean that up, along with lowering the car even further, I think you'll be well on your way to that .3 cD.