The Hexacomb method is the way to go. Works better, looks better, and a lot easier to carry around.

Cheers!

I, too, have been thinking of using wood blocks for a plywood hexayurt. I used small patches of sheet metal on my last one, but did not get sufficiently tight seams. I would make blocks 1.5″ x 3″ (much smaller than the London hexayurt’s blocks), and cut a 120 degree in them. I would put at least 5 along each edge (like with my metal patches), depending on thickness of material. before screwing them all the way in, while there was still a gap between the panels, I would caulk between the panels to get a good seal.

Cool that they used recycled wood and just threw it together to prove the concept of the method. I really like the slight overhang, too. However, I think it best to put the door at least 4″ from the joint so you are not joining wall sections and making a door frame in the same place. It’s complicated and weak. I think the door opening should be a hole in the wall section, completely surrounded by plywood–at least 1.5″ at the top and bottom, reinforced by a 1×2 (.75″ x 1.5″ piece of fir).