Coincidentally I was reorganizing some of my boxes-o-stuff last week, and ran across a pair of flat panel layouts I had forgotten that I had fabricated, using .063" 5052-H32 aluminum.  If anyone can use them, they can have them for $15 plus postage for 15oz. from 22942. 
 (U trim & bend using the second sketch at https://aafradio.org/garajmahal )/ART-13_mount_fabrication_sketches.html )
   73,
- Mike  KC4TOS