Challenge - Maximum outline relative to Z-Axis?

What process should we use to find the maximum outline of an arbitrary object (closed, or open polysurface) relative to the Z-Axis ?

In the attached (random) example we want to create a cavity in the box such that the object slides in perfectly. To do so we need to find the widest possible perimeter about the Z-Axis.
(The red curve in the file is the XY intersection, to illustrate how not to do it)

Thoughts ?
Thermoform.3dm (112.2 KB)

Hi Thomas - `Silhouette’ from Top? Does that get you the right thing?


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Needs cleanup afterwards, but a great idea. Combined with “project to cplane” we can find the opening profile. Thank you !