If the cost of replacement is around $200,000, I'd be exploring all avenues including bonded repairs. It is not the typical solution for a 30 year old strutless Cessna but the design, materials and installation methods are available. Bonding patches to metallics in the aerospace industry is not new, just technical and expensive. Bit of trivia, even the Westgate bridge in Melbourne has tonnes of carbon fibre adhered to the concrete (not steel) structure to toughen it up.
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