This Chevy has not been sectioned, just chopped and the roof laid down. A pretty straight forward chop and drop for this model.
When you want the low look without chopping the roof, one would "section" the body. This involves taking 1-4" out of the body horizontally and thus lowering the beltline, roof. The effect would be like raising the chassis and fenders.
This was a very "East Coast" way of customizing in the 50's. This type of customizing is not done much today as it is very difficult.
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1940 ChoppedChevyCoupe