Anyone ever built a geodesic dome ? (quite big!)
Any advice to offer ?

Requirement is for once-a-year assembly, short use, and then on-site
storage for the remainder. So it needs to dismantle and re-assemble,
but doesn't need to be especially portable or robust. Budget is of
course negligible.

I never thought I'd get to use the phrase "I think you should build a
yurt instead, it's so much more practical", but this seems to be
fitting the bill !