Great work!

Two thoughts, for what it's worth:

First, in the historical section you cite Culloden, then the Sir Walter Scott/Victorian influence, but then when you state that--

"Contemporary THCD settled into its current form in the early 20th century and was largely codified by the 1950s."

--I want more detail. What influenced that codification? The war? The British royal family? The evolution of the Highland Games both in Scotland and the Scottish Diaspora?

Second, are fairy wings an iconic THCD accessory? ;-)