wagonwheel uni ?

OK guys, I know very well when unicycles were invented. I only need it
to look plausible. I need the unicycle to look like it COULD have
existed in the rennaissance, which it very well could have. There is no
technology in the average unicycle which did not exist in 1533. So,
anybody know who I should call to see about buying one, having one made
or getting instructions on how to make one myself ?