I was checking out the Springfield Custom Shop and they offer a service of "bobtail style" and "Round Butt of Frame and mainspring housing". I have a Springfield 1911-A1 Loaded. I was thinking of this type of customization. Anyone do-it yourself on either of those mods? I guess it would involve refinishing the butt of the frame. How difficult a job was it for you? Parts cost as well? Thanks.