first, i LOVE this implementation! it really gets at looking past what you are actually looking at, to do the thing you want to do. it is dramatic.
could something go wrong? it is likely, yes. but as a kustomizer of stuff, that is part of the deal. and it amazing what does actually work.
but you definitely need to keep an eye on the situation as you test it out. i have personally ridden unusual items for years, but my 12 year old neighbor can bust the same stuff in short order
it seems that a less dramatic implementation might have been to make a paralel tube as a mount, but so much less cool. even a strap on the outside would add strength, but again, reduce the impact.
how thick are the joiner plates/caps? a really thick plate could surely work
i will be curious to see how this holds up over time, please follow up
this has captured my imagination due to its counter-intuitivenes