Don't own a bead roller. Hard headed enough to try this. Started with a 3/4 plywood base. Added 3/8 strips to outline ribs. Added sheet metal and more wood strips to hold everything together. Then the fun began, tried all kinds of tools and shapes, by hand and pneumatic, failure after failure. Finnally found the dome shape on the end of a 3/4 in round stock would work by hand. Also found that 3/8 depth of rib was not working. Added strips of thin plywood into the rib moulds. Got several hours in that first rib with the shrinking spots in it. Way too long. Welded the domeed tool onto a shank to fit my air hammer. Added a air regulator too. Now we're talking, about 7 minutes each on the other ribs. Tool broke twice, not sure what to do about that. Turned the whole thing over on concrete floor and did some hammering, stood on it and bent it untill it got pretty flat.,even used the air hammer again with a flat bit around the edge of the ribs. Not perfect but good enough for my trunk floor in my 56 Fairlane. I'm qute proud. If anyone has any tips that would make this better or faster I'm all ears! Thanks for looking!