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The tool box would need a frame to sit in, since it would be in the car while driving. All you need for this project is a stick of angle iron, cutoff wheel or chop saw, T-square, a handheld drill, and an MIG welder. The frame should capture the bottom of the toolbox with next to no gap. Leave a little fudge room (no more than 1/8 inch) to compensate for any warping, and for paint thickness.