If I were in your shoes I would stick with the Kalyway 10.5.1 install DVD and update your system with the new Voodoo kernel manually. Then ensure you have AppleDecrypt.kext, Disabler.kext, and AppleSMBIOSEFI.kext files I've PM'd you as well as Chameleon. Then just update your system using single-system updates available from Apple's download site until you get to 10.5.5 where you need to install the DSDT patch (I'd use the patch app made by PCWiz over at his site) if I were you. Then you will be ready to update to 10.5.6 and fix your audio and video.

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