You can try with this dsdt editor, just extract the DSDT and apply a couple of thoes hacks, like the Snow Leopard CMOS fix, its quite easy to follow.
Once you apply the patches compile the DSDT and a window will popup and tell you if there are any errors or warnings. Some of the errors are listed in the DSDT fix list, so when you fix all the errors you can finally install it, it could be on the root or extra folder, depends on your chameleon's config. To check if it's been loaded you can start chameleon with "Wait=Yes" and check if it's been loaded. You can also specify the DSDT.aml path with something like this on the com.apple.boot.plist:

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CPU: AMD Athlon 64 3000+ @2.3Ghz - Motherboard: ASUS A8N-SLI nForce4 SLI - nForceLAN by eno - SuperNForceATA by Medevil - RAM:2 GB DDR 333Mhz Audio: ALC850 Video: XFX nVidia GeForce 8400GS 256Mb (0x06e4) QE & CI from Chameleon 2 RC4Ethernet: Realtek RTL 8139 Series (working out of the box) OS: Snow Leopard 10.6.4 (aryajuanda's guide) + Windows XP 64bits