HondaSiR- Before I begin, I do not mean to offend you with this reply. I apologize in advance if you are at all offended by my reply.
Even so, your point does bring up a problem. You said "an exact model replica", right? How can a fan make an exact model replica, when KITT has so many variations to him? Look at "Knight of the Phoenix for an example. KITT's bumper changes in between two types, the original prototype and the style bumper that we see mainly throughout the rest of the series. But then again, throughout each season, KITT's bumper changed. And, correct me if I'm wrong, but didn't those vents disappear by Season 4? So, when you say "an exact replica", it's impossible for an exact replica to be true because like his human counterparts, KITT himself goes through an evolution. So, even if they wanted to, it's still a representation, because its representing a certain period in the series.
But, even as a fan, the model hobby craft affords opportunities and challenges. However, the original MPC model wasn't 100% accurate, either. I mean, throughout all the episodes that we've seen... In what episode do we see "Knight 2000" on the nose of the front of the car? I have to also refer to a previous post I made here. I read an article on TV and movie car kits in an issue of Toy and Car Magazine. They had a special "Entertainment Models" article. In the artical, it talked about MPC and their original General Lee model. From what it was stated, it was common then (and still now) that most models that were meant to be TV/Movie related merchandise were in fact retooled from other models. The MPC General Lee was retooled from anothe Charger model that the company had printed. Not 100% accurate, yet fans still bought it and put them together. The same can be said with the MPC KITT kit.
A fan trying to make "an exact replica" would be impossible, particular with cars from TV shows and movies. Some TV shows use one particular vehicle for the star car, like the '57 T-Bird in "Vega$", but the car is never damaged nor changes in the show. KITT hasn't stayed the same throughout the whole series. He's been taken apart and rebuilt so many times that even I can't remember the number of times its happened. So, building an exact replica for KITT would have difficulty, because there's so many variations. There is a solution to this, by saying "building an exact replica of KITT as he appeared in (insert season here)". Therefore, an exact replica would be a representation.
Though I know that it doesn't back up the flaws of the KITT kit, but these flaws are minor to "Knight Rider" fans who always wanted to have their own KITT, but didn't have enough money to buy the real thing and do the conversion on it. This has to be true, because I'm sure that the Kenner KITT car had many of flaws that fans didn't mind. There's one thing that is a fact, it doesn't matter what the model's accuracy is suppose to be. It's about what the finish product means to the fan who builds it.