I suggest watching the following video of Sako making their carbon fiber stocks.
To duplicate their exact process would likely be cost prohibitive, but it provides some great insight on what could work.. Adopting their method of using a CF sleeve over the foam core, rather than CF sheets, is going to make the stock exponentially stronger.
What I am having a hardest time envisioning is how to get adequate overlap of the CF sheets when using a two piece mold. If you don't have the overlap, you essentially end up with an epoxy seam running the entire length of the stock. I would be very fearful that long term recoil could end in catastrophic failure.