I have a pre war 405 Win double and a 20ga Double rifle that Bob also built. @crs helped me with a introduction to Marie on the purchase of the 20ga. I wan't fortunate enough to have communicated with Bob, but from everything folks who knew him have said he was a true gentleman. The Simson will be a great doner action for your build. Also If you want something a bit larger than a 45/70 I have a 45/100 reamer in the shop you are welcome to use.