Across our driveway will be an 8 foot high by 12 foot wide facade, consisting of three 4x8 sections. They are simple 2x4 frames covered in pink foam. The center will be bolted to the two end sections but I need to make the entire thing stand up. My initial thought is to run long pieces of 2x8 perpendicular to the outside bottom uprights and then run some long diagonals from top to bottom. Does this sound feasable? Is there a better way? It can't be attached directly to any structure and has nothing to lean on so it will be free standing. Thanks for any guidance.