Well you can't look a gift horse in the mouth. By brother in-law gave me a 1/4" thick piece of sheet steal 24" x 60" to use for a building board. However I noticed there is a slight bow in it. I am debating on how to secure the piece in order to get it as flat as possible and not have it permantly secured to my workbench. Neighbor said I should weld some square tubing to the back in a frame.

Thoughts, Ideas, Etc...???