Harv, to answer your question about importing a rifle, it is really quite simple. Dispite hating the C68 laws, it does create one positive thing. We are all considered 'dealers', at least from a personal importation point of view.
If you want a rifle from Fiftydriver, get the serial number and all data, register it with CFC, fill out a form from DFAIT, they will send you the Cdn govt approved copies in a couple of weeks, send that down to Fiftydriver, he fills out State Dept forms, wait for 3 to 4 weeks for approval, get approval, and he sends the rifle to you. You have it verified by a CFC verifier, entered into the database, you own a new rifle.
costs will depends on what people want to charge. Except for postage/courier, the Cdn side is all free. The State Dept forms are free to fill but companies charge something. If you have a gun built, you can work that out with Fiftydriver.
The time to get all the paperwork done is about the same as having a gun built, so start early and the paperwork might be done when the barrel is test fired.
Second option would be to get a reamer and cut a barrel up here. Doubt that will get Fiftydriver's approval but is a viable plan.
The dies and such can come up with the rifle. Just needs to be included as part of the export forms.
Hope this helps...
Jerry