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In article ,
says...

Hi Steve,

As Bugs suggested, I suspect this is the best you'll get from this
group. There probably aren't many true structural engineers who hang out
here, and those who do may have reasons for not wanting to get involved
(ranging from boredom with structures through to liability).

For the record, since I'm an ME, but not a registered structural
engineer, and am not privy to all the construction details of this
device, I've deliberately avoided making a judgement on its safety.

As has been demonstrated, one of the problems with your proposed
structure is that it isn't as simple as it looks. Its behaviour is more
complicated and less easy to predict than I thought, and probably than
Ned and Bill thought, too.

Why would you assume that? It's a very simple problem - the only thing
that makes it appear out of the ordinary is that it's more easily worked
by looking at the vertical member's slope rather than the more commonly
solved for deflection.

Ned Simmons