Quick way of creating mullions and fake interiors.
All Geometry Nodes based.
Version 1.0 Tutorial here: https://youtu.be/cdANwK4XVDM
Version 1.2 tutorial here: https://www.youtube.com/watch?v=-O6AeKVBQg0&ab_channel=WashingtonFilho
Compatibility Blender 3.4 +