I think the original usage of "design vocabulary" in architecture, as I understand it, made sense...from the standpoint of, let's say, understanding things like the differences in Ionic and Doric for instance, and being able to pick and choose classical elements to incorporate into a new design. I think it usually sounds like idiotic trying-too-hard when it's applied to vehicles.
91% or higher ISOPROPYL alcohol is said to be effective on some lacquers. It's really really cheap over here, and is available in grocery stores, pharmacies, etc. 70%, common "rubbing alcohol", is a good cleaner, but it doesn't have much effect on paints.
For what it's worth, it appears to me to have pretty good proportions, as far as representing the overall impression of what it's supposed to be. I've spent a fair bit of time looking at 911 Porsches and their variants.
I remember the Beach Boys Racing version. They chopped off the sail panels / roll-bar and laid the windshield back too. Probably the best looking 914 body kit ever done.
The Chalon was a good looking conversion kit too.
Below is one I designed and built for a client. The owner of a well-known Porsche parts house wanted a kit-car developed to go on a 914 that was styled after the 904. I was in the process of finishing this, we had a falling out shortly after this photo was shot coming out of my basement, and several people over the years have claimed it as their work. I can, of course, prove it's my design and my work. (There is another earlier version done for the same company that's an ill-proportioned turd, so poorly conceived as to be un-buildable. NOT my design. Which is why they hired me. )
A guy here on the board...afx... did a conversion to the flared version, but Revell never did. Here's the thread: http://www.modelcarsmag.com/forums/topic/72527-porsche-9146-gt-casting-begun-61814/?page=1