Well, was not as easy as I hoped getting back to my ICS build. Nandroid restore kept giving me this error on all my backups.
"Error while restoring /data!"
So I had to go back to stock 4.0.4, reroot, and then restore my backups. PITA but could of been worse.
Anyone else having problems with restore, just follow this guide....
Current Phone: LG G2, 32gb - ROM: CM 10.2 M1
Old/Backup Phone: Samsung Galaxy Nexus, 32gb - ROM: JB-JDX
ASUS Nexus 7 - 2013
ROM: CleanROM 32gb