It's tied in at four places on the front, nothing else I can do there, besides...there aren't twisting forces there. I've done much more than any other conversion I've seen, it's safe.
Pretty much the only thing I could do to add any strength is do make sheetmetal panels to fill the spaces between the tubing and dimple die them.
Be sure the safest rule is that we should not dare to live in any scene in which we dare not die. ~Lewis Carroll~