I spoke to the president of our club, the CJMC and he told me the CT90/110 are really Passports that a dealer in Boise modified for the farmers in the area as farm bikes. Honda found out the dealer was selling so many of the little bikes that they went there and found out how the dealer was modifying them. They copied the design and out came the CT90.
I don't doubt that at all given some of the technology, or lack thereof, on the earliest CT's. My favorite is how instead of the dual range transmission of the later bikes, the early ones use a multi-sprocket rear wheel. There was the standard Cub/Passport sprocket and then a huge additional sprocket for hill climbing or hauling. You had to add/remove a section of chain and run on a different sprocket to switch "ranges". I love it!