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Here's why the kickup sections were fabbed from 4x1 3/4-inch box. With the long boxing plates trimmed and welded, they overlap the box section to provide a stronger joint than a mere butt weld. The section I cut off was then used to box the rearmost section of the chassis. The recess will be filled with a section of 3/16-inch plate, so once everything's welded and dressed, this whole area will appear to be 4x2-inch box section.