You're right David, Guanajuato is a beautiful state and I really love the capital, I'm often there !! regarding the ST S40 you are planning to install, I think it will not have enough oomp and your Tsunami will not shine in the air, you will end up with the OS 46. I think the piped YS 45 will overkill, remember this is a very light airframe.

Regards
Francisco