I think Pilou has a good hint there, there is a hex dome here for example:
http://sketchup.google.com/3dwarehouse/details?mid=d63037b783145b7e2137e32e8ebf2b1&prevstart=0

You can import data from a polygonal (obj.) file in moi with this utility:
http://kyticka.webzdarma.cz/3d/moi/#importobj

There is a couple of sketchup->obj plugins available I think...

Nice subject!

Marc