So your problem is not actually related to this guide since your old kext is not fully functional to begin with? I'm afraid I can't help much in that regard since patching from scratch involves a lot of trial and error.

You will have to try out different port mappings by following king's guide and see for yourself if it works. Try to reduce your configdata to only include the minimum number of ports for basic usage OR you can try searching for a good kext which works in leopard so you don't reinvent the wheel.

Also, avoid using chameleon rc3 if you're on 64bit since it doesn't have fully working 64bit efi support which leads to sound assertion errors during boot.

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Core2Quad / MSI P45 Neo2-FR / HD4870 / Snow Leopard