Had Ubuntu Touch on my N4 and Multirom on the N7, as I saw that Multirom is also available for N4. So followed the "old" thread (pre 6.10.13) and now have Multirom with Ubuntu Touch as internal rom, works fine.
That happens when you don't read it all and start messing prematurely.
Now I start again with KitKat, Multirom and Ubuntu Touch.
Still got problems with Active Plasma, http://files.kde.org/plasma/active/4.0/images/nexus7/
, but one day will get it working on the N7, would be nice to have that on the N4 as well.
Damm, so much to do and so little time.
Nothing is impossible, only miracles take a bit longer!