OK, I have a working 9.2.2 install using the universal installer.
It seems I had a collection of issues. First of all the mix of bad RAM, unreliable installation media, and a dying DVD drive meant I was getting mixed results and weird errors on startup of the OS 9 installer. After I narrow them down I got the universal installer to boot in No Extension mode (Shift on boot) and was able to run the installer through without issue.
Next, the 9.2.2 install would hang at the end of loading all extensions, as mentioned in the Sonnet and other board manf documentation the 'Apple CPU Plugins' needed removing. I thought it may of worked with the latest and greatest version in the installer, but I guess not. I booted to OSX and removed the file, and OS9 booted.
But, again, at the very end of the boot up it went to a black screen, but booted fine in no extension mode. I suspected it was the graphics so I switched in a known good ATI Rage 128 VGA/DVI card for the Rage 128 ADC card that was in there, after boot the resolution jumped to 1600x1000 mode which I didn't even know my monitor supported. I corrected it back to 1650x1050 which I know was a good combo for the Rage and my monitor and switched the cards back, and it worked perfectly.
Thank you everyone for your tips regarding documentation and such.