Yep...u'r nuts. But hey, its fun!!
However your thinkin' isn't very cost effective. To purchase a complete new rifle simply for the donor action seems a waste of resources.
Call Jewel trigger and ask what one costs for a Remmy clone action. It'll surprise you.
Price a barrel from any of the manufacturers. Gonna spend that anyway to replace the bbl from the donor action.
Price a custom action and consider delivery time. It'll surprise you too.
The only "extra" thing you'll need is a stock. That'll make the big difference in cost of the custom. Smith charges will be about the same for either the donor approach of custom approach.
Chew the fat with Jim See and see what comes out.