David,
Actually, the action profile should be fully defined in the software used to make the action. If this were to be a fully intergrated project, that data could be used by someone with a CNC stockmaking machine (e.g., Coles, CSM, etc).

I would expect that some liberties would be taken in the stock inletting area of the action to reduce the stocking difficulties as much as possible, while still retaining the original look as much as practicable. I think I'd consider this project similar to the Ford GT project where they didn't replicate the original GT40, but rather made it a commercially viable product with modern conveniences/enhancements.