If you use broad enough definition, where making a car entails mining your own iron ore and building lathes, presses and milling machines from scratch, sure. Otherwise plenty of people have built cars (including engines) and other vehicles from start to finish.
The question was not about building however, but understanding the design of the whole thing down to a fine detail.
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According to freakonomics, not a single person in the entire world can make a pencil from start to finish.
Now a car? NO WAY, not even Musk.
http://freakonomics.com/podcast/i-pencil/
If you use broad enough definition, where making a car entails mining your own iron ore and building lathes, presses and milling machines from scratch, sure. Otherwise plenty of people have built cars (including engines) and other vehicles from start to finish.
The question was not about building however, but understanding the design of the whole thing down to a fine detail.