Todays market
Is against sporterizing anything but Combloc imports, and those mostly with bolt on parts. 30 or 40 years ago you could still build a very nice sporter from a milsurp rifle, but today, you will spend more than a new factory sporter, sometimes a lot more.
Converting your Enfield would be taking a $400 rifle, spending $800, and ending up with a rifle worth $200. I have several custom rifles built on military actions, rifles that cost hundreds of dollars to build several decades ago (I know, I used to build them), but are only worth a pittance in today's market. mausers, Springfields, etc., with absolutely beautiful wood and metal work, and they go for $3-400 dollars at the gun shows, because today's buyers (mostly) want stainless steel and synthetic.
For your self, as a project, by all means, go ahead, build a fine rifle, just don't think your work will have any reasonable commercial value. Collectors want issue condition, hunters want all weather guns, and kids (of all ages) want "EBR"s. I buy old sporter conversions for cheap and enjoy myself tremendously!