You have to rotate the touch surface, but no the screen itself.
Take a look to the "/etc/X11/xorg.conf.d/99-calibration.conf", but be warned that currently this file is overwritten by the config system. I've to improve it!
Please, when your system is working OK, son't forget to send a little report, including photos and details about your specific configuration tweaks, so i can include it in the configuration tool.
P.D: Nano, ya estás mostrándome ese Zynthian valenciano!! Ganitas tengo de verlooooo!!!