To stiffen it perhaps you could trying glueing some carbon fibre sheet on it? https://www.easycomposites.co.uk/high-strength-carbon-fibre-sheet If I wasn't so behind on my Absurd Tourer project I'd probably have an offcut to give you.
Cheers i might be able to make a metal screw in brace plate and fix that to the inside to help resist the twist. Just realised your the bonkers WW tourer guy. That looks mental.
@Retro_Bastard started
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To stiffen it perhaps you could trying glueing some carbon fibre sheet on it? https://www.easycomposites.co.uk/high-strength-carbon-fibre-sheet If I wasn't so behind on my Absurd Tourer project I'd probably have an offcut to give you.