New guy---

I think you may reallyhave something there!!
The reason for the scarcity of Doubles is obviously the cost.
The problem with most hunters is they are not gunsmiths.

How about a somewhat different approach?

I think that thatyour suggestion is an excellent approach for those with gunsmithing abilities. but another
alternative might be for you to sell rifle components, ie a completed action in the white with the addition of other components such as various barrels and wood sequentially at a later date. A schedule of costs for the basic components with the guarantee of acess of all needed components over a specified period of time and the guarantee of certified final proofing the final product to make it work would be appealing to some.The concept is that the outlay for the Double would not be endured at one bite.

The result could be an individual paying for various components of a Double over a finite period of time to be assembled and proofed at some later agreed date . Someone could even obtain multiple barrels for the same action and build a gun that way!

Could this be done with Heym components?

Building a Double on a time plan.Strange, but after all time is money.