I found this on a german site:
http://blog.stenki.eu/2011/09/asus-p5q-als-ein-perfekter-hackintosh/
There is DL link for a DSTD, but I did not try it (yet). Maybe this might put you further.
He succeeded with it...
Confirmed, you don't need a DSDT for the motherboard.
I have used the same kexts and have successfully installed Mavericks on my computer.
All working fine, including iMessage / Facetime / iCloud / App Store
Happy days