Not sure if you are aware but Cabelas' sells a finished Boyd's thumbhole for the LA Savage for about 165.00. I bought one a while back and bedded my 300wm action and barrel. Made a very nice set up. I was pleased with the fit and finish of the stock with one exception. I didn't get a feel for how the top of the thumbhole area was built. It was flat, kinda like a aircraft carrier and was a little distracting to me.I recently got a Richards' microfit stock in the dual grip thumbhole. Much like you are doing, it is unfinished. It however is different than the Boyds in that you can grip it in the normal fashion, addressing the one thing I didn't like about the Boyds.Getting ahold of Richards took me two solid months of calling before I happened to get someone to answer the phone. They do not return emails or phone messages. I like the stock though and look forward to building it up for my O3A3. It is not a drop in fit though. It's about 95% which means just about every surface including the barrel channel will need hand fitting.
Good luck, I do like the look of the varminter.
elkman06