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In the immediate post above I was thinking in Mesh terminology. In #1 figure the body of the vehicle could be constructed with a CAD program as an object without cutting off sections as described using Boolean difference. Also there might be an operation where you can provide the parameters of an object. i.e. the number and lengths of the sides. The dimension of the front and dimension of rear i.e. 1 inch by 1 inch (front) to 3 inch by 3 inch (rear). I have mainly used mesh packages but if you need accuracy and precision i.e. pistons in an engine then CAD "Computer aided Design" would be the choice. For a toy car as in the example you could use whatever approach you wanted. The bottom line you you have many choices for design and the right one depends on your needs and goals.
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