Catia V5 Can someone post links on how to create a tubular chassis?

I have taken a Formal Catia Course. I know that a Tubular chassis can be made using construction lines, and the rib feature, followed by a shell feature. But not sure how to gto go about it using an existing 3D model. Can anyone throw up or show links to how its done? Even if its in a simple model such as a sphere, cube, or trapezoid. It would be helpful. My hope is to create a full chassis for my car including a set of dimensioned drawings so that anyone could build it with basic welding, and fabrication skills.

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