TheWhiteFalcon said:

Both are also quite rare (fewer than 150,000 Cubes ever made)...I'm not going to lie; not the biggest fan of FrankenMac-ing the rare ones at this point.

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I agree with Falcon on this point... I'd leave the Cube a Cube and instead opt for a less rare machine to franken the CC with such as an early G4 Mini, which are twice as fast as a Cube anyway.

I'm not terribly comfortable with the idea of irreversibly franking a Colour Classic either but I guess if there is a really poor example out there that is electronically cactus, then it's probably a good way to re-use the machine.