Yes, from what I understand 11,2 PowerMac support was pulled from MorphOS 3.10. It could see distribution eventually, but I personally wouldn't want to see it cannibalize X5000 sales.
AND the X5000 is much more power efficient (G5 PowerMacs make great space heaters, and their fans at full speed are quite loud).
Your experiments with using both the Radeon 9200 and the Voodoo3 sound interesting. The extra memory on the Radeon can be put to good use.
Is it possible to use both cards for display, or does using Voodoo3 preclude the use of the 9200 for display?
And if Warp3D is the only component missing from the 9200 driver, it sounds like we just need a talented coder.
The fact that W3D support exists under OS4 and MorphOS provides two examples of how this can be implemented, so it should be easier than using a Linux driver as an example (of course the lack of source code is problematic, but I can remember disassembling machine code on the 68K, so it shouldn't be impossible to examine the PPC code to get an idea of what its doing).
Addendum - Oh, has anyone thought about using a higher end PCI card like the Radeon HD 5450 in a mediator? Again, there are OS4 and MorphOS drivers for that (albeit without W3D support), and that would be a kick ass combo with the Sonnet.
AND, how is the attempt to backwards engineer the Sonnet going?
It ought to be possible to build faster variants of that card.