Dixie Gun Works sells both finished and kit guns on their web site. All types of guns for almost any era come in kit form. They also sell all the bells and whistles you would need to finish it. If this is your first, they have a great tech support to answer questions. I've been doing business with them for over three decades and they are good about standing behind their products.
If you decide to use them be sure and get one of their catalogs.