The plastic model may be good for general feel, but once you add the trigger and trigger guard, and in the proper place it may not be comfortable at all.
Any time I make a new pattern, I use a mock up trigger locator to get the placement right. All Savage stocks use the rear action screw hole as a reference to cut the inlet. Once the hole is there, the stock is fixtured on a pin in that hole. That is the x,y .0.