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The main limiting factor in how thick you can go with fabric composite is the hardening ratio. Polyester resin cures through an exothermic reaction...if it generates too much heat it can ruin the composite and even catch on fire. Thats why casting resin uses a very slow cure. You can adjust this by altering the catalyst and hardener. The exact amount depends on your resin, your climate, and desired thickness.
But you are talking about wood, which is not a Micarta/fabric composite, its a wood laminate. Your main problem will be penetration of the resin into the wood. This is usually done under vacuum and very high pressure. You more than likely won't get good penetration by just doing a hand layup. So basically you will probably end up with wood pieces glued together, but not a very deep penetration of the resin into the wood....unless you have a pressure/vacuum setup. If you want to try it then the thinner the wood, the better. The thinner the resin the better. The drier the wood the better. The softer the wood the better (cork absorbs much faster than ebony, etc).
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