I just found out about this project from the LeFever forum. I am very interested.
One question, would modern metal change the weight and balance characteristics from the original significantly?
Two comments:
I agree with the poster that a facilitator, to move the project along through each step would be helpful to those who have never attempted something like this, working with custom stockers, engravers and metal folks.

I don't know if the legal matter for a name has been looked into. The LeFever Arms Co. name is still being used by the gunsmithing business in Lee Center,NY. It is no longer in the hands of anybody in the LeFever family since Bob LeFever retired and sold out. Bob passed away a couple of years ago. I would suggest considering using the D.M. LeFever (+/- "and Sons)name. That hasn't been used for 100 years and I am not aware of anybody in the family who would object although I haven't polled them lately.

Great-Great Grandson of D.M. Lefever
www.lefevercollectors.com