Tinkering with a window

[Mitchell (the other one)]

I'm tinkering with a window symbol to add a different munition pattern.  The first image is the window inserted in the wall and looking as expected.  The second is the same window after I edited the 3D component adding the new muntins.  The window symbol now cuts the wall inline with the exterior edge of the interior trim.  I tried adding 3D loci and made a further mess of things so thought I'd post the question for guidance from wiser minds.  Thank you in advance.

[Mitchell (the other one)]

A little later after some tinkering I solved the wall cutting / gap issue with new 3D loci at the corners of the window frame.  (not the trim)  And then started again with a different idea.      Using two symbols, one for the window and a second symbol for the mullions with class control I get the look and control I was looking for.