Just finished a 2.75m (9×9 ft) square piramid for a trip to Nepal 
Body made of 0.5 Cuben, many reinforcements of 0.8 and fabric patches of Cuben hybrid. Took me many hours to make, but happy with the result. Weight is 600gram. The corner seams have a catenary of max 2.5cm (1 inch). Additionally I made a separate silnylon floor with a possibility to attach it at 8 points to the 20cm vertical walls of the piramid, thus creating a sort of bathtub. The vertical walls can also by used as snowflaps. All seams are taped with 3M tape: 9460 and 9469 for zipper and some Velcro. Only sewing was used for the webbing (see picture below) The top of the pyramid is quite a thick package of many reinforcement patches with a inside extra layer of hybrid Cuben. I made a coupling devise for using my skipoles: some dyneema fabric and Velcro. Weight of this is an enormous 6grams. Another picture (these are just the first pictures taken in my garden, just before it started to rain, didn't want to get wet…)
Some detail pictures: A waterproof #5 zipper:
And the process of taping:
Making reinforcements: Sewing webbing from hybrid Cuben:
Making patches:
Finished patch with 0.8cuben between hybrid and body:
Next pictures will be of the tent being used at 4000 or 5000m elevation in Nepal!
Zipper is still working great and bonding remains solid after three years of extensive use. Here is a picture of the tent on Coyote Pass (Border of Sequoia NP and Golden Trout Wilderness) taken this last weekend. 
Inside view:
