That’s right !

The 2X15 episode of the SGU series allows me to answer to my question, namely : what are the angles of the sides of the gate ? Are they equal ? And what about the moving ring, is it equal too ?

The answer on the picture:

https://i1.wp.com/i64.servimg.com/u/f64/11/04/52/61/profil10.jpg

So it’s really easy to calculate this angle knowing the width of the central and outward ring.
The sequence of operations will consist in showing an approximate model from a piece of  the gate that will not have details, only a form on which thereafter we could sculpt all the rest.

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