For SketchUp lovers :)
From:
Frenchy Pilou (PILOU)
7 Sep 2016 (4 of 8)
8081.4
Trick is of course to draw an external more one component for more easy modification! ;)
Here the ground is a part of the box, but have not importance!
Only the 12 edges of the box are indispensable!
EDITED: 7 Sep 2016 by PILOU