Fiberglass stocks would have interior surfaces made primarily of epoxy and fiberglass (if they don't have aluminum bedding blocks). Whether the internal structure is laid-up fabric or cast with chopped strands, I don't know, but it strikes me as feasible. Fiberglass stocks are probably a good comparison, since they're made in halves. A few crossbolts in vital sections would be good for reinforcement.
I have made a forend and buttstock for a Rossi single shot, but that's a completely different animal.
Edit: My mistake, it looks like McMillan at least fills the hulk with an epoxy putty which is then has the inletting milled out on a CNC machine.
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