Thanks, folks. Right now it looks like I have to use fillers because the areas under question are small and, in the case of the rear thimble and ramrod channel entry, structurally such that I don't want to remove any more wood.
ON top of all this, the original maker elected to route out a ramrod groove that ended up short rather than drill it all the way, so I will be reinforcing that area with a tube and a lot of poxy
Thanks again and,
Don't shoot yore eye out, kid
Greg Geiger
The Capgun Kid