I can see the barrel nut if you like to play and you will try new barrels or if you will build several rem/age, I don't see a big downside other than asthetics.
If your only going down this route once its less of a savings as you will need the nut wrench and way to hold the action (action wrench)which eats up a good portion of the savings of having a smith chamber and fit.
If you are going 18" I think your slightly heavier contour isn't a bad idea as it will give some weight out front. I assume that the compact is because you will be either carrying the rifle while still hunting or want a short rifle for a blind. In either case a little weight out front helps make it more shootable.
I can't comment on the stocks as I haven't ever had a HS and my only B&C in years was the rem Ti pattern, which though light is too fat in the grip for me.
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