You shouldnt really need to do all of those DSDT patches for your mobo to work with Snow, i.e. the Ethernet/Time Machine fix can be done with Chameleon options, or the ICH9-R fix I think its just for having internal icons instead of the default one.
I would advise you to install Snow with minimum patches needed (i.e. only the RTC patch) and then when you get it running, try to apply the other patches if needed, and one by one, so you can debug the DSDT properly (if something stops working how would you know what patch went wrong?)

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AsRock P45TS | C2D E8200 | GeForce 8600GTS
Mac OS X Snow Leopard 10.6.1 + Windows 7 Ultimate 6.1.7600 + Fedora 11