I use pre-anodised 1.5mm aluminium, and machine the lettering into the surface using a CNC router with 0.4mm cutter. Trick is to only machine a tiny amount, literally like 0.05mm. Then the holes and perimeter are cut with a 3mm cutter, and the edges folded with a sheet metal folder.
The PCB brackets are done in plain aluminium.
It’s time consuming getting the machining height exactly right, but the results are great, and the panels are pretty indestructible.
I really must make a video showing the whole process - it took a while to refine it, so would be good to pass on the info in case it’s of use to anyone.