Height is 13 ft - 6 in or ~ 65% of diameter.
A door fits in a lower square area. Door dimensions are 75" x 40" for
reference.
Strut lengths range ~ 65" to 75" for the 21 ft dome.
Having forgotten this page, I made another one you might like to see.
It shows some new illustrations and options including the -X1 Subdivision
of this Octa-Dome 4
Part
2
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Octa Dome Types