I've got couple of grilles (Duster) needing shipping, preferably by UPS or FedEX, not by truck. Both used, so no original packaging available. I have two boxes, 12x12x64 that are more than large enough, 200 pound test. I also have some heavy 1" thick corrugated cardboard corner protectors that came on a large computer rack that I think can serve the same purpose as a board as a solid mount for the grille in the box (they unfold to a 10" wide flat "plank"); I have enough to put one top and bottom of the grille. I also have a lot of heavy 1/4" thick corner reinforcing cardboard to use outside the boxes.
I think if I wrap the grille bottom in foam or bubble wrap, strap it (bottom) to one of the thick cardboard panels (64" long, grille centered about 4" free space at each end), slide it in the box, fill it with packing peanuts, then glue the outside reinforcements to the 64" long corners, that the grille would be adequately protected. I'd rather not try to build a crate and definitely don't want to pay for one.
Should that be sufficient? That would give 4" of packing peanuts at each end and 3 to 4" of peanuts around three sides of the grille, and the full 1" of corrugated cardboard underneath. The cardboard plank will keep the grille centered.
Thanks!
Rich