Again chain by design is not taut when working. Even much stouter chains such as those on motorcycles and industrial machinery must have slack or the chain does not function correctly and can fail.
And again they are in no way designed for lateral loads.
I get what you’re saying, and I like your outside of the box innovative thinking.
However chain does not function the way your supposition says it does.
Even if you tightened the chains well beyond working load spec they would still deflect quite a bit, even more so with your upside down thought.
I want a vertical Maslow too, that would of course be ideal from a space saving perspective.
Speaking of, have you seen this thread?:
It may be the answer to the vertical Maslow, might get us there.