Firstly much thanks to batmanofzurenar for taking the time out to put forth a comprehensive guide. In the interest of making the process as simple as humanly possible however, ALL that needs to be done is simply this:
(PLEASE NOTE: that while I cannot confirm that this method will not work on other unsupported Macs, these instructions refer/have been tested to be FULLY FUNCTIONAL on unsupported Mac Pro models ONLY)
Things you will need:
the "mach_kernel" file ONLY from the "Essential Dp1 V2.zip" acquired/downloaded from here:
http://www.insanelymac.com/forum/topic/289062-109-mavericks-simple-vanilla-hackintosh-install-guide/
AND Chameleon Wizard Version 4.2.2
Then head over to jabbawok's blog for his guide "How I installed Mac OS X 10.8 Mountain Lion on my 2006 MacPro 1,1" and start from the beginning
http://www.jabbawok.net/?p=47
Once you get to this step:
Next job is to copy mach_kernel from MacOSInstallESD to the Installer partition.
In terminal navigate to the Installer ESD with: cd /Volumes/Mac\ OS\ X\ Install\ ESD then copy mach_kernel to the installer partition with cp mach_kernel /Volumes/Installer/mach_kernel have a quick look in terminal to see that its there with: cd /Volumes/Installer/ then ls . You should see it there.
omit it as in OS X 10.9, the mach_kernel (invisible or otherwise) is no longer located within the root of the OS X 10.9 installer.
***INSTEAD unzip the "Essential Dp1 V2.zip", locate the mach_kernel file and simply Drag and Drop it into the root of your OS X 10.9 Mavericks Installer image.
Proceed with jabbawok's guide and while following EVERY STEP complete it in its entirety.
ONCE COMPLETED YOUR NOT QUITE DONE SO DO NOT ATTEMPT TO REBOOT TO YOUR INSTALLER JUST YET !!!
Install and Open Chameleon Wizard Version 4.2.2
Click on the 1st icon located in the upper left hand corner of the .app entitled "Install"
Then click on the middle tab entitled "Download"
Next make certain that "2246" is selected in "Chameleon revision"
Then click/select the "Update" radio button and also check the square box field underneath entitled "Update more boot loader files etc."
Lastly, within the "Target partition" field, scroll through the available disk images and locate the "BOOT" partition you created in the very first portion of jabbawok's guide and installed Chameleon-2.1svn-r1921 on.
Click the "Install" tab located on the very bottom right hand corner and complete the installation process.
Basically what you are doing here if it is not so obvious is updating the Chameleon version from 2.1svn-r1921 to v2.2 svn r2246 on your BOOT partition as v21_r1921 no longer works for booting OS X 10.9 Mavericks. Within my first attempt at this process, I instead downloaded the Chameleon v2.2 svn r2246 .app and installed it from scratch rather then updating it through Chameleon Wizard. For some reason the only way I was able to get a fully functional working OS X 10.9 Mavericks OS system is by this method (updating your "BOOT" partition from 2.1svn-r1921 to v2.2 svn r2246 via Chameleon Wizard).
***LAST STEP
Again using Chameleon Wizard, click on the middle icon entitled "SMBios". Next click on "Open" and within the "Extra" folder you placed inside your "BOOT" partition while following jabbawok's 10.8 guide, find the smbios.plist. Then select "Edit". In the field entitled "Premade SMBoises", scroll through the various Mac models, find and select the "Mac Pro (3,1) - LGA775" profile in the list. My findings indicated that this seemed to be the only profile that did not cause a kernel panic upon start up. Hypothetically you supposed to be able to then "Save" this new updated populated information within the smbios.plist though I could not get that to work. So I instead opened the smbios.plist with Text Edit .app and edited manually with the Chameleon Wizard Mac Pro 3,1 auto populated information myself. Once the new info is entered save the smbios.plist file back in your "Extra" folder on your "BOOT" partition and THATS IT !!! Enjoy your OS X 10.9 Mavericks OS 64 bit system on your Mac Pro !
Hope this is helpful to folks.