On the cheap, this is what I come up with off the top of my head and you can bet there's more than I've thought of.
Barrel vise: $124 - $155
Action wrench: $68 - $115
Headspace gages: $55 - $60
Mauser action complete: $150 - $400
Stock: $100 - $500
Total: $547 - $1230
This is using the barrel you’ve got, the original trigger, safety, etc. Add a Timney trigger, Buehler style safety, finish on the stock and metal, etc... Well you can see where that's going.