Say it's maybe $200 for carbon fibre vs $50 for Al (the difference isn't that great but being generous). Either way the raw material price is going to be dwarf

Say it's maybe $200 for carbon fibre vs $50 for Al (the difference isn't that great but being generous). Either way the raw material price is going to be dwarfed by the labour cost building the enclosure, which are also immaterial in your $50-100k budget.