16 points is enough to not change the result. Getting 16 points isn't hard, you don't have to be a master modeler. Just focus on lots of detail, add as much as you can. Exhaust, mirrors, gearbox detail, interior detail etc. Cars of that era had simple paint jobs anyway. Werner just wants to see you have made a genuine effort to reproduce the original car and the detail it had. It's actually not as hard as people think just expensive to buy all the bits.
I have always built can am because they are the easiest to detail up. I won APC with a 16.5 body in 2014 against Paul's 20 point body.