I agree that the subjective areas should be left out of final results, but should be included in some way as a side note.
I'd want to know about nonfunctional additions to the car, gutted interiors, etc when I was looking over the results.
This sounds like a really fun idea and I would be interested in seeing just where my car and I fell in line with some others out of general curiousity. I've tried to keep my car a well rounded daily driver and this would be a good way to find out. I've got no illusions about my car and have no desire to try and fill one of the 5 spots for the competition, there are plenty of others better suited for that.