Not sure what difference there would be between customizing and customizing for Moose.... It's the same as far as I know.

1. Trigger work or a new trigger
2. Boyds stock is good idea... although look at Prairie Hunter type designs as well as they are close to a traditional hunting stock
3. Pillar bed the action screws at the minimum... may need to glass bed as well. Warning!!! the glass bedding is a COMPLETE PITA.
4. Leupold VX2 in 3-9 or 4-12 (just a recommendation)
5. not really needed just for a hunting rifle, but you can also look at an aftermarket barrel... Through Northland Shooter Supply

You should at least take a look at them because you may want to make a precision rifle for your next project if not this one.... Trust me... You will get the bug just like the rest of us... It's an addiction!!