Hi Bernd
I am not against aluminum tubes to connect the DUO 900 but I thought I would connect the type boat like your Zeeman.
The beam that holds the mast, even if made of aluminum, must be reinforced with stainless steel cables so as not to bend ...
As for the work here in southern Italy (Peschici Puglia) I have day temperatures between 16/17 ¡ã and with the greenhouse type structure I arrive at 20 ¡ã for 6/7 hours of day.
Next week I finish the first hull.
