I'm adding it to the Mechanicus list and will ammend the SoBs so they can take it as a Special card.  I'll update the v5.2 lists up on the Wiki too.  

I have made the Psy Blasters a physical psychic attack (seemed to be the intent seeing Daemons use 2 cards to save) and the Psy Cannon and Psy Explosion Ethereal attacks to be consistent.

Just one question though: Does the Psychic Explosion when the Resonator goes boom (5-6 result) take out the Psy Titan itself?  I assume yes but would like it confirmed.

Ta

Ok, updated Adeptus Mechanicus book with Psy Titan is up on the Wiki.  I've noted two minor typos that I'll fix, but have a look and LMK if that's what was intended.