I looked at the website and found double angle extrusion made for 4mm thick panels. The Webstore only shows double angle extrusion for 1/4" and thicker panels. Is extrusion for thinner panels available?
If you take a look at all the double angle extrusion on our website:
https://penn-elcom.com/flight-case-hardware/extrusions/double-angle-extrusions
You can pick the most suitable model numbers and we can give you a price and availability.