Actually that metal framework when bolted to together with good strong 3/8 bolts tighten up real well in combination with the 3/4 plywood makes quite a stiff structure.
No concerns about swaying,.....its tight.
My one concern was how the cantilevered tip of the upper deck there might eventually bend downward,...just over time rather than due to the load. That carfloat and the pier structure stuck out on the end do not really weight very much. And I built that 'water tray structure' out of the same robust 3/4" plywood that I felt would lend rigidity to the peninsula's tip,...and I glued that tray together along all its edges. However I did NOT glue that tray to the underside of the deck piece, which would have made it even stronger.
It all worked without any horizontal piece underneath.
As a 'just-in case' I have added one more piece of structure that I have not mentioned, nor photographed yet. I'll do the tomorrow.
Okay, here is a couple of photos of my 'just-in-case' support piece,...just a plain old piece of plywood bolted to the lower staging track beam and wedged up under the 'water tray' above.
No concerns about swaying,.....its tight.
My one concern was how the cantilevered tip of the upper deck there might eventually bend downward,...just over time rather than due to the load. That carfloat and the pier structure stuck out on the end do not really weight very much. And I built that 'water tray structure' out of the same robust 3/4" plywood that I felt would lend rigidity to the peninsula's tip,...and I glued that tray together along all its edges. However I did NOT glue that tray to the underside of the deck piece, which would have made it even stronger.
It all worked without any horizontal piece underneath.
As a 'just-in case' I have added one more piece of structure that I have not mentioned, nor photographed yet. I'll do the tomorrow.
Okay, here is a couple of photos of my 'just-in-case' support piece,...just a plain old piece of plywood bolted to the lower staging track beam and wedged up under the 'water tray' above.
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