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Sure, you could build a surface of wood or foam splines, and 'glass over the outside to hold the shape, and then do the inside to get a sandwich-core part. That way, you don't have a mold left over. The weight savings from the core will probably disappear into filling and fairing the surface. The wood core would want expensive, hard to sand epoxy, so the urethane foam sounds better, if you can handle it neatly. Using a thick build-up and then removing the foam is also a valid proceedure, but it tends to require more fiddling around the details. Fortunately, it is very easy to add bits to a 'glass part.
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