Go for it!
There were millions of them (Mosin Nagants) made, and made as fast as they could, most times.
Now if it was a Fin M39 or some other (better made) one, I'd let it be.....but the one you are looking at...Go for it!
I would have the barrel cut back a little & recrowned, as they are known to have poor muzzles from the conscripts poor cleaning practices.
The 7.62x54 is a nice round and should make a heck of a hog gun for you.
Make sure to say "HI!" to them for me, with your new rig!
If I can find it, there is a site about doing just what you are talking about...on the cheap....If I can find it I will post it here.
Post Pics when you get it done!
Take Care & Have Fun!
Tall Shadow