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I make carbon plenums and intercooler piping for turbocharged race cars running 2-3 bar boost and in excess of 700hp - monolithic carbon layup for 2mm wall thickness. I use pre-preg, so for wet-lay I probably would consider going an extra 0.5-1mm thickness.
Your geometry won't be helping you here, flat walls will fail easier than walls with some curvature to them. So if changing the shape slightly and making new tooling to incorporate some curvature is an option, then you can save a bit of weight/material that way. Otherwise, your suggested layup sounds fine. You could also do a rohacell core as Lester suggested, but I do prefer to do these sorts of parts monolithic.
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