I'm tring to do this. I've done it before, but it's been at least three years.
I'm doing it from teh RH7.3 SRPMs and need to get a wireless network card into the modules(?) at least I think that's the lingo to use.
Finally got to the point that I actually see a bunch of (.c) files. Also, I think I've actually compiled the kernel. I have a new vmlinux file. But I have been able to get it into grub yet.
Will keep you posted.