Well, last time I checked, Sandy King is not too far from the east coast of the United States - maybe 220 miles from Charleston, SC. One of the costs in getting an existing holder would be shipping to Calgary. If it is shipped within the US it would be quite reasonable. That is definitely the way to go. Let your woodworker look at an original. Your group will quickly save in time what you pay for the holder. I have also found that one can spend a lot of time and materials prototyping, which would be saved by seeing a very good functioning unit.
Good luck, and keep us posted with your progress.