The weather and wind conditions allowed me to go to the beach and test my 90Three framed with 6mm pultruded rods. Leading edges are Structil. Spine and Lower Spreader: (single piece) Exel Cruise. Upper Spreader: 5 mm. The wind dropped quickly after I arrived at Meijendel beach. Quite amazed by the low wind capabilities of this frame. First test is very promising. Looking forward to try it in a bit more wind.
Plans for the 90Three (and other versions) are available here: