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I am using blender internal and referencing that course
Faces have warm and cool colors. There are samoe good tutorials to achieve that on YT. Serach for Substance Painter.
Both points good to know
chrismckay and 
tbrbn for future modeling.
But can the model also drive as good
its me
You are right, Thibaut.
Just to bounce on the engineering comments, in the end it really depends on the usage. Boats need to have as little gaps as possible to avoid leakage. Space vehicles are technically bound to heavy stress and needs deformation tolerace, hence multiple parts (among other arguments such as constructions etec.)
😁
Did I? LOL. Age makes you forget those things.