Assuming it's a 7mm Rem Mag (there are only a dozens of 7mm cartridges out there after all), that would make it a long action so any staggered feed long-action stock would fit it.
Barrel can be had from any number of companies offering pre-fits or any gunsmith can make what you want from a raw blank.
As for the trigger, why waste your time trying to fit an AccuTrigger? Just spend the $100 to get a good aftermarket trigger and be done with it.
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