New Bench, Old Doors
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Pretty easy project. I cut a solid door in half lengthways and then cut the length down to about 57 inches.
Cutting Spacers and Seat
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I cut 4 inch strips off the sides of 2 hollow core doors the same length. Then made 10 spacers out of old wood shelving. Then just started gluing and stacking.
Last Step
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After glue set I would pre-drill and fasten them together. Door/slat to spacer, repeat till I got to the solid end piece. Then I ran one long wood screw the entire width.