this is an ode un innit ?!
interesting if anyone can get it to work (might source me a 2nd hand PPC mac if it does !), but I seem to remember AIncs reasoning (back when we still liked 'em) that they couldnt do a version for PowerMacs cos of apple never being likely to release the info required to not do a hack, which is effectively what the Linux crew did to get linux on powermacs. now, Linux is community software, and AInc are (for want of a better word !) a company, which would leave them wide open for being sued should they market the technology to run an alternate commercial OS on a closed platform. also, it wouldnt be in Apples best interest to have a better OS (as at the time, OS4 was better than their offering, natch !) on THEIR platform.
upshot: technically, very doable. legally ? potential bl00dy minefield for everybody but Apple.