RE: Anybody try the Apollo Yet?
I think that experimentation with different mast components is an interesting path. I've done some mixing out of necessity, and I've found the results can be quite acceptable if stiffness differences aren't that great. Yet, I think a lot depends on the focus of the mixing effort. I feel that concentration on different tops, as opposed to bottoms, will most likely lead to a more workable outcome overall.
Once you've had the opportunity to test and validate your ideas, I'd really like to hear more about what you learned.