welcome. all that you ask can be done but it will cost you. your rifle is probably staggered feed(mag stays attached to action when out of stock).
1.some have machined the action to make it "centerfeed", costly unless you can do it. CDI offers an bottom metal assembly that converts yours to accept detachable mags, over $200 but they will inlet your stock free of charge.
2.with the right tools changing barrels isn't hard at all. good quality barrels are all over the place, depends on what you want to pay. several of our sponsors have barrels that will work for you at reasonable cost.
3.Bell & Carlson makes a nice stock that will work for you, imo.
4.triggers you have Rifle Basix, Timney and a few others. need to know what pull weight you want.
if you got the time,,money and patience you can get it all done. just do it in steps, a little at a time so it doesn't break you.
Bruce
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