Earlier I had decided on the bonding strap approach based on forum posts and recommendations from other builders. After actually drilling the vertical stabilizer and rudder, I came across specific instructions in an FAA document – Advisory Circulat AC43.13 – 1B/2B page 11-77. Turns out what I did was exactly as required by this publication, once again proving luck will beat skill on most occasions.
Because I already have tinned copper braid for the strap, the lower material listing is the one to follow. Only “Washer B” made from aluminum alloy is not in my inventory, I have all the rest. A quick order to Aircraft Spruce can quickly resolve that issue.