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@gbj_tester
Yes, it's legal. Frame members cannot exceed 3:1 or 80mm deep, but there is a region near the joints where 'fillets' can stray outside these bounds. Even without a fillet, the angled intersection of two 80mm x 27mm elements will be more than 3:1 if you measure in the right direction.
I think Cervelo's FEA guys will take issue with the idea that it's not making a structural contribution too.