hi Bob,

I thank you for you post and infectious enthusiasm! There are no commercially available plans for what you are looking for - an 'azumaya' is perhaps the closest Japanese equivalent to a pavillion, though they are not canvas roofed.
If you want to do a curved hip roof, or more complex, you may be biting off more than you can chew - and more than your time frame would suggest. If you would be happy to have a flat-planed roof, then I could drum up some pictures for you. Here's one to be going on with:

And here's another:


Let me know if there is anything else I can do to help.

Regards,

Chris