Jeff, the owner, has chosen to go with complete caliper rebuild kits from Brakecrafters. These were sourced directly from the company via their eBay store and cost about $60 per caliper.
I had heard of this magical Red Rubber Grease but had never tried it, but I'm a believer now. This stuff is made from castor oil and is specifically formulated for rubber brake parts, NOT for metal-to-metal lubrication. It lubricates while adding corrosion and oxidation protection. A very light coating is all that's required and the parts just glide together, compared to using brake fluid during assembly. The tiny containers provided in our three kits will probably last me five years. It's always nice to find another useful tool.
Next up I'll rebuild the three master cylinders and the clutch slave. Keepin' 'er movin'.