Trial succeeds via:
1° - Import a .3ds file in Meshlab.
2° - Export to the format .Obj
3° - Start the stand-alone plugin Obj23dmWireframe
which converts the file .OBJ format, into a MoI file .3 DM

3 times in 2 movements I got the perfect structure of a Geodesic Octahedron Frequency 6.

An octahedral Dome has the advantage to fit on traditional buildings; & unlike Google tips library, my file is designed for a true realization of a dome; its base is flat, & all its dimensions of struts, connectors, pannels + all the angles, are known at start.

Use CadreGeo6: http://www.cadreanalytic.com/cadregeo.htm ; to create any appropriate or suitable geodesic structure, & to obtain all the parameters for the construction of the dome.
This is the only engineering program, very affordable price, enabling for any designs, any kinds, of reliable geodesic structures. A module for Google Sketchup also exists (but I don't clink at all to this program & its library of tinkerers).

See you a later.