Again, I am not an expert in lost wax. I have limited pleasant experience getting such things done. True experts have told me it is better to do this in pieces.
I have zero expertise in 3D printing. If you go that way, I simply cannot help.
As far as Mr. Brasseur is concerned, I have had two contacts with him. One, he gave me implicit permission to duplicate this casting, and two, he unequivocally indicated that Lionel does not want the Legacy part evaluated for modification. I have no working relationship with him - he seems like a nice guy, so if and when you decide to go the 3D printer route, have someone who knows the topic contact him. If you do print a one-piece wax, I am sure I can help get it cast in brass or bronze. Have the printer increase the size by one half of one percent, to account for metal shrinkage upon cooling.
So, question? Assuming someone can get this thing coded in some machine language for printing in a 3D printer, what is a good guess for cost each part in wax?