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Try looking up vacuum bag wings for model gliders. These have been made over a male mould foam core exactly as you describe for many years. Once you get the idea of how to do it then its fairly simple. Care needs to be taken with how much resin you use in this process though.
If you're using a straight profile (ie same profile over the whole length) then you can use male and female moulds. You use a hotwire to cut the profile, lay up over the male part with a vac bag, put it back in the block of foam you cut it from (female part) and leave it somewhere warm to cure.
Depending on where you are I may be able to help.
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