For me, Big Red was the first PT car because I would seriously drive that car on the street daily and it was the first I can recall seeing a brick fly through the air that well. That one car changed how I viewed performance muscle cars to this day. My DD all through my 20s was essentially a race car with two seats and a dash that I managed to put plates on and dealt with the hassling from the local PD regarding exhaust noise. Of course, if they heard it, I probably was getting off easy if they were talking about the noise and not what I was doing at the time to make it
PT is better defined by Mark's series of Camaros, but seriously, if you take a 60s-70s car and put some fat tires all around and lower it down a little to make it look like an old Trans Am racer and at least appear like it would handle better, you are Pro Touring as far as I am concerned. Money shouldn't matter; should be like gifts, the thought is what should count.
Skinny front tires and fat rears = Pro Street
Fat tires all around = Pro Touring
The 66 Nova SS chassis I bought a couple weeks ago I intend to build starting later this year will have 16" wheels for the track - they will be 11.5"/13" wide, but they may be too small in diameter to be PT by many standards
All the other stuff you can bolt/beat/weld on is just a measure of wallet, not intent or love for one type or the other. Most, if not all of us on this forum live in the USA or other "free" countries where we have near complete freedom of expression and ability to make and spend money easily - we've already won the galactic lottery - what we do with that freedom of expression is just how we are spending our winnings if you will. I consider getting to debate something as frivolous as this v. where I am getting my next meal is pretty fortunate... so I don't care about labels all that much.
Now, when N.O.S. (en oh ess) became NAWS - that is a debate worth fighting