Gosh, what a bummer. So sorry that happened, and hope insurance will make you whole. This does seem to illustrate the down-side to fillet/tig construction and curved tubes. I imagine that it will be difficult to repair. Unless it's just too painful, I'd love to see some close-up shots of the fillet joints on the damaged tubes, to see how they faired and to understand their limitations/strengths better. Trying to make lemonade, I guess.