Basically, the story, as I know it, is that after WW1 there was a shortage of ships, so it was decided to import chassis only.
In the Model T days dealers built bodies, so we had our own look. Ford Canada came and investigated and didn't like the variable quality, so they setup a Ford factory here.
The open Model A built here looks mostly, on the outside, like every other. However, underneath is a lot of wood framing for the body, which might have been sub contracted out, for local content laws.
Local content laws were pushed for mainly to protect our Sunshine harvestor factory and promote home grown manufacturing (of which there wasn't much), so large tarrifs were applied.
Open cars were the simplest to build. Tourer was a British term.