I have one more minor modification to incorporate into the final design before I order. I believe the 90 degree bend that forms the shelf the counter mounts to would benefit from a bit of reinforcement. A small crease at a right angle to the bend is all that's needed. I will be drafing this while I run some tests this weekend. More updates to come.
I am told the typical time for shop drawings is 6-8 weeks from the time of order, still a week or two off. This will be cutting it short for the USATF meeting, but I'm hoping to stuff some stockings this Christmas.
I have had considerable difficulty finding suppliers of speedometer cable pieces. I've contacted the primary suppliers, but the fittings are no longer in production thanks to modern electronics. Once the basic counter is in production, I am confident I can adapt it to a cable-driven rig if suitable hardware is found. I've yet to come up with a solution for less than $50 to rig the cable, and that's my break point. The counter reads very well with the proposed mount.
Thanks to all for your input.
Tom Riegel