Hi. Biggest issue you're going to have is finding a smithy who can do 55 degree, 1"x14, Whitworth threading. AKA Enfield threads. Isn't the same as regular American threads. He'll need to have the proper barrel vise bushings and a correct action wrench too. If the guy has to buy any of that stuff, you'll be paying for it but will not be keeping it.
Somewhere I have the barrel shank drawing. Don't remember if it was online or in a book. I'm looking.
This is as close as it gets on-line. It's from Gunparts. 14 V tpi, .985 dia. shank, .687 shank length.