I had some 5’x3‘ flags printed up and used those to wrap the frames. They worked out perfect. I didnt care if the artwork wrapped around the sides and actually preferred it as it gives the panels a three dimensional appearance. For those who would want the artwork in a full frontal...
A few years back some of you long standing members may remember a thread I put up detailing me building reflection panels. I constructed a half dozen of my own reflection panels. 48"x24"x4" with Owens Corning 703 2" insulation boards and some burlap.
Heres the link if you want to check that...