Drilled holes through the forming blocks and aluminum blanks to mark location of slots. Then took the aluminum out, re-joined the forming blocks, cut off flanges at the bend lines, then separated the forming blocks to sand the radius on the edge of the block. then re-joined the blocks with the alumium blank between them and bent the flanges. then laid out the top, bottom and both sides on assembly table marked with a grid according to the plans. Rivetted the parts together, and there is my bulkhead F6.
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