The high pressure and vacuum techniques are used to make the part with as little resin as possible, which makes the part as light as possible. Without using pressure or vacuum bagging and just using standard fiberglass lay-up techniques, the parts will be heavier. This may be OK for your application compared to other construction techniques available to you.
I've used some carbon fiber with standard lay-up, but only as a stiffener reinforcement in an existing fiberglass, Kevlar, or wood part. I've never made a part strictly out of just carbon fiber and resin.
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