Growing a chassis...

Problem #1 that had to be solved: Develop a framework to generate nicely 
beveled prism-like objects.

I wasn't sure whether I could pull this off by combining sphere_sweep 
and prism objects in some mathematically smart manner, so I ultimately 
settled for a nice framework to specify polygons with basically linear 
outline, but rounded off at the vertices with circular arcs of arbitrary 
radius. This also makes the whole thing easier to control.

The downside is that the heavy use of CSG already starts taking its toll 
on rendering times, so I needed a quality parameter to switch beveling 
off for quick test renders.

Problem #2 to overcome: Decipher the blueprints. (fortunately I do have 
some at all :-))

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