KEXTs: How to update helloKernel.kext to run on Snow Loepard?

Hi
I'm working through the HelloKernel tutorial in the Kernel Extension Programming Topics document.
However that's a few years old now and hasn't been updated, and there have obviously been some relevant changes with Snow Leopard with the consequence that the tutorial is out of date and it won't work on Snow Leopard.
I've had a look through the Kernel Extensions release notes for Snow Leopard and I guess my problems are maybe stemming from 32/64 bit architecture issues?
The problem I'm getting when trying to start the .kext from the command line is:
"can't load hellokernel.text - no code for running kernel architecture
failed to load hellokernel.kext - (library/kext) requested architecture/executable not found
I'm running it using kextload which seems to be deprecated now, but still get a problem if I instead use kextutil.
What should I be setting the bundles to in plist.info?
In the tutorial it says to use OSBundleLibraries of com.apple.kernel.mach and com.apple.kernel.bsd.
But the SL release notes imply I have to instead use OSBundleLibraris_i386?
However I've tried several permutations of bundles and project build settings (32, 64) but keep getting problems.
I'm experimenting with permutations as I can't find any documents describing exactly how to build .kexts for Snow Leopard.
Does anybody know what my problems are, or know of a good set of documents *that is up to date for Snow Leopard*?
TIA

1. If you're using Safari 5.1.10, it's up to date as far as Snow Leopard is concerned. Going further requires upgrading the computer's OS.
2. Back up your data, check your applications for compatibility, and download Mavericks from the Mac App Store.
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