[Wlug] rpm's for kernel modules?

I've dabbled in making rpm's from tar distributions a bit -- just enough to get a flavor of rpm building. One of the more challenging (frustrating?) rpm tasks is building an rpm for a kernel module. (Or maybe the tar/make package I'm starting from is just not well-designed.) Since the build can be kernel-specific, it's not even clear if building binary rpm's is worth it. Maybe a better idea is to concentrate on making the source rpm easily buildable so that the end user can generate an installation-specific binary rpm and get the benefit of rpm's over tar/make installations. Or, maybe it's not worth rpm's at all for kernel modules. Anyone have opinions on this? TIA, Bill