Why spend all that money renovating/altering a utility gun that some feel has value as it stands?
You mention custom engraving. So you have to anneal the frame/furniture, have it engraved, have it rehardened. What kind of money will that cost? You're trying to turn a truck into a sportscar. Sell it and buy a gun that suits you. Add up the figures and either wait to find a nice high grade Lefever or buy an alternative gun from CSM if you like American guns made to your specifications.
I've never understood the prediliction of my fellow Americans to spend all this money on these hardware store guns rather than buying a good quality gun that suits them in the first place.
(Now if it was Grandad's gun and you want to freshen it and pass it on to your daughter I can understand that...what price sentiment?)
It costs little more to renovate a suitable high grade gun than a utility gun, and it's money better spent, IMHO.