Most "hackintosh" topics working on 10.5 applies to 10.6 as well. And calling 10.6 kexts hybrid is a bit wrong wording. The term is fat binaries and are two separate compiled kexts but in the same binary package. The reason 10.6 kexts do not work in 10.5 is not due to the added 64 bit arch, but because the changes made and sdks and therefore not compatible anymore