CT,
If it flips your trigger, do what you like. You've been around this board long enough to make an educated decision on what type of work you should do on a gun. Take this one for example. I'm betting you're thinking of holding true to the original in most ways, but make it fit you and shoot well. I'm also guessing you'll make all the finishes like the original. I believe Oscar mentioned that the very early Sterlingworths were charcoal casehardened as opposed to the later Fox guns which got molten cyanide salt casehardened. Likely someone like Researcher can nail down whether your's was charcoal or cyanide hardened.