Sorry, there weren't any official rules.
There is a short mention about Divisio Telepathica (Along with Divisio Mandati and Divisio Investigatus) in the Adeptus Titanicus rulebook. And GlynG is right; in 1st edition Space Marine rulebook there is a mention about Codex Titanicus II that will be released "soon" (it never was ÂÂ
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) and it was supposed to contain rules for PSI titans, Zeppelins and Juggernauts as well as some other stuff.
The names for the parts (warp cannon etc.) came from GWUS online store where the PSI titan parts were available as bitz for a short while along with the never released dropship, Exodites and Eldar X-vehicles.
The cannon has four parts (base plate, right dome, left dome and the cannon itself) and the head is a special PSI titan head.
EDIT: The custodian titan rules (i.e. rules for the head and the devotional bell) appeared in WD133. Custodian titan is a Warlord with custodian head annd a devotional bell. However, there is only one custodian titan per titan legion.