Rather than face the uphill battle a marginal OS normally gets on PC hardware, MacOS X on Linux would immediately inherit the most advanced device driver development team ever imagined. No shortage of drivers for obscure hardware. No drivers with obscure bugs. Heretical as all this may seem, it is completely plausible and most importantly, possible. Rhapsody is UNIX based, Linux is UNIX based.
Rhapsody is in a period of re-architecting, a perfect time to switch kernels.