First Upright erected (rain stopped play) I cut out the notch from the bottom, but thought there may be a way of wrapping the off cut around the other side of the pyramid beam, while keeping one end attached.
Resting on 2 Metalclad 'pyramid' beams with door edge off cut core of grp / fire resistant plastic . Made of a dry wall lining c-stud 90mm on 92mm tracking beam on bottom.
The galvanised dry wall lining. Middle beam is flat 92mm c-stud
prototype for shelter base being able to move or roller beams
it was mentioned on http://www.appropedia.org/Hexayurt_playathat a hexayurt could be picked up & moved to cover a piece of earth warmed by sun during day to benefit from floor heating at night.
I thought of a way for heavier shelters like my wedgeblock design to roll on it with concrete fence beams (they have handy grooves for rollers to ride in) with plastic rollers, that were rescued from a scrap yd
Attempt to make a fire resisitant upright & beam from 150mm Purlings & 142mm c stud from dry wall lining . The core is grp composite / plastic core door edge off-cut.
Tanalised timber would be a popular choice of core material
This will be combined with metal skinned rigid foam panels that we have in stock (se pic)