If I understand correctly the OP, he doesn't have either rifle action to begin with. I can get into a Zermatt Origin action with Trigger Tech and Hawkins M5 DBM in stock from Bugholes for $1300 after shipping and transfer fees. Add another $1300-1500 for CF pre-fit barrel and stock. The AnTi will be about $300 more when available.
A new Tikka is $750-800 + tax or transfer fees and shipping. Plus possible gunsmith fees to remove the barrel. Bottom metal is another $200 if your going to ACIS, and still $1300-1500 for a CF pre-fit and stock. The only thing you're saving is about $200 for a trigger and what you can sell your take off parts for. Then there is the time factor of the build, especially if you're really trying to wait for a good deal on a used donor rifle. Who knows how long you'll wait for the right deal?
What about weight? The Origin SA with trigger will weigh the same as a Tikka receiver and trigger, with the LA Origin about four ounces heavier with trigger. AnTi actions will weigh about 6 oz less than the Origin.
I used to love Savage, and have used several for rifle builds. However, they are no longer a cheap option for an action and they use that stupid bottom bolt release. Then they are the most expensive option for a lightweight stock.