I've yet to drive more than a few miles on these new ties, but they're the same tires I use on my Cayman S, and I like them.
So, for all intents and purposes, this project of restoring this Miata is complete. There's really not much else that it needs, and I've certainly spent far too much money relative to the car's actual worth. My goal now is to actually drive it, and of course I want to drive the Cayman, too! It's tough when you don't have to go anywhere for work, to put miles on cars.