Openbeos FAQ says: Currently no OpenBEOS except on x86.
It says there's NewOS, will will be someday for iMac, but in no way the PPC is mentioned.
It all was ready to read on openbeos.org.
[edit: PowerMAc instead of PPC: Still the same as I said above for OpenBEOS. And POwerMac: Don't know if that is G3/G4. NewOS will someday be on G2/G4, they say. But not now.]
