"Richard Smith" wrote in message ...

If the strength had been any less / if it hadn't felt right when
assembled, I'd have probably done that.
Form a "tent-shape" triangular truss part, rising diagonally from the
deck to the top of the first "stanchion" then sloping down diagonally
to about the middle of the deck?
Ultimately - the strength was enough, while the secondary steelwork
with the "clue-sticks" incorporated drew-out the safety margin
desired.

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The most effective place to add support to a cantilever structure is about
1/4 of the way in from the end, as long as its beams are equally strong in
tension and compression.