What about old fashioned fun? Something to do? Why does it have to make sense? Come on there is all kinds of "stupid", "bubba", "insane" whatever projects all over the shooting web sites. Most I don't get but someone does. I know a guy who spent a year hand filing and shaping poorly forged parts to make a Hepburn receiver. It was beautiful but he could have bought 2 new ones but they never would have measured up in his mind. And he had fun, learned things, developed skills.
Cost? Who cares if you decide to do it and have the skills or friends who do? Buy the receiver and barrel. I have a friend that could do the metal work and have fun. He's retired and likes doing that stuff. Bing bang whoopla - you have a barreled action. Spend some time on a stock trigger. Now you have a workable trigger. Stock would take some thought but I assume it could be done with some gouges and files.
A little time and work - A Mosin Target rifle. Fun to shoot. Fun to show. Not expensive. A break from monotony. Maybe a Mosin that shoots 1/2 MOA. Could win bets, make you rich, buy an island, live in luxury.
Whose to judge?