NLXTACY
Wits' End
I made a fairly simple backing board using 1/8" x 1/2" aluminum strap that I bent and bolted in place to hold a sheet of plywood (or ABS). It's the economy version of @NLXTACY's setup I made a few years ago.
View attachment 1504020
View attachment 1504023
Actually I saw yours and thought, "how can I over complicate it and make it far more expensive?"