For my uses I will indeed be having a very close to the ground platform and a taller roughly mid height platform. Otherwise it is not a practical design for me as Erin pointed out in his review. Not an exciting prospect lifting a large expensive loudspeaker onto a platform nearly 4 feet high. I have one client that designs loudspeakers that are in the multiple hundreds of pounds, and that we are doing prototype work for currently. A perfect example of what you cannot do with a Klippel system.
Someone had mentioned having the moving part of the contraption on the ceiling, that would provide an easy way to have a low speaker platform without the need to maneuver around all the moving parts when placing the speaker, but that idea does of course create its own set of challenges.
As far as potential hardware designs, I have attached a CAD sketch of the concept that
@Dave Zan had years back in this thread... just to make things more complicated.
I like the simplicity of motion and that it gets a spherical surface, but after sketching it up to fit in within the space that I have, I have some worries on the maximum size of speaker that could be measured (since it is best to keep at least the high frequency driver at 0,0,0 of the measurement shell to prevent the number of needed coefficients from going out of control).
It's a simple sketch, but if anyone thinks it's worth pursuing the design, then by all means, please provide some comments, input, or suggestions.