Well I dunno what @Dartswinger70 means by proper build, but weather you paint it or not, a "proper build" would resemble a car that has had love distributed evenly. My personal build has many custom aspects with a "70s day II" theme. Everyone "proper build could be different, but I would avoid calling that 74 3 on the tree 318 shitbox duster I used to thrash a "proper build".
Basically, its different for everybody.
The BB, mini tubbed, sub framed, EFI, narrowed tank, black on black, home built, extravaganza in the downstairs of the establishment I call "home", is a proper build...........to me.
I also feel that fella with the patina car called "vixen" is doing a proper build, just differently.
No, Im not running for office, but I tap danced around your question like friggin peg leg bates!!
