New open source house - ideas

Hi,
I would like to ask your ideas and help regarding a new hexayurt project in Northern Greece.

Some basic characteristics of the study area are the following:
• Mean annual temperature ranges from 4ºC in January to 24ºC in July (min -13ºC, max 42ºC)
• Mean relative humidity: min 53% in July, max 82% in December
• Mean monthly rainfall: min 0 mm in July, max 390 mm in December
• Mean wind speed: max 2 m/sec in March
In a nutshell, it is characterised by rainy climate and high humidity rates.

I would mainly like to know your opinion about the most suitable materials that could be used.
Any other advice or suggestion would also be welcome.

Thank you!