Total wild shot here, but I would try a few stocks from other bolt actions, mauser, carcano, whatever for maybe a half-decent fit of the upper action area. Barrel, magazine area, etc. Could be fairly easily contoured or fitted by an amateur like me. Maybe. Sure would be easier than trying to carve out from a virgin piece of wood. Good luck, in any event.
BTW, what's that pile of torch-cut pieces that are visible on the bench? Now, THERE'S a project, I bet!