How to Build an Aluminum Extrusion Frame for desk filming

This shows details of how I built a support structure I use to do UA-cam filming of projects.
It uses 2040 aluminum extrusion and several gantries to mount:
Lights x2
GoPro camera
Macro adapter on GoPro camera
HDMI monitor for framing and live review of footage
Could also be described / used as a document camera.