The  6 frequency, class 2 icosahedral dome - 2 new  pages describe the hemisphere dome and short version.

Hemisphere

Short version

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A new tree house dome design is based  on the Icosa Dome -X1 VB = vertical base modification.
Bottom edges of the dome are 74 inches, making front to back almost  10 ft.
The tree goes right  up through the middle (floor deck boards and dome cover panels shown removed).
A simple mounting platform deck design is shown, based on doubled up 2x6s.
We also make welded metal mounting brackets for the platform-tree connections.
Special additions to the design are the added roof extension boards, tree hole, and Mounting Blocks that make a mini riser wall.
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