Thi brings me to another consideration:
I'm focusing to determine the nature of the maker, but its nature is determined by its products, so a McLaren is a racer builder when we consider an MP4\17 but is a 'normal' maker if we pick up the F1 Supercar.
We can still have this generic 1st layer, but we can add a more challenging layer, where we add all the tags for the models of that make:
Ferrari = 1) Normal (can't find the right word for this sorry) 2) production, race, concept, coachbuilt
Chaparral = 1) Racing cars builder 2) race cars
Savannah = 1) school 2) concept
Exner = 1) designer 2) production, concept, coachbuilt (Chrysler 300C, Mercer Cobra, Chrysler D'elegance Ghia)
Alfa romeo = Normal 2) production, race, coachbuilt, concept, replica (giulia, 33TT12, RM Sport Castagna, Gransport Quattroruote)
About the designer, that is a good question, Bertone started as a designer, but now he's a coachbuilder, like Giugiaro and his Italdesign. Fioravanti is a designer, a concept maker and part of Pininfarina's team in the past.
On the other hand, cars like the McLaren F1 or the LCC Rocket are intrinsically related to Gordon Murray, but probably only the latter was (almost) designed by him and only him, while for as regards the F1 it was more of a team work, even if he was the leader and main contributor
You are considering the model and not the Maker\name: here we have Mc Laren, LCC and Murray.
Mc Laren = racing cars builder (but also few 'production cars')
LCC = production cars (ok is a small brand, but they are for sale and for road use...)
Murray = is not a company, He is more an individual, and if we want to include him in this list, we can include engineers with the designers.