G'day guys,
I've picked up a handful of Morrigu Fire Support Vehicles to use as Ordinatus Minoris and while they're en route I'm trying to find suitable titan grade weaponry to magnetise for them. I've been looking mainly at Exodus Wars because of their great bits range. Issue I'm having is that I'm unsure whether the scale of the weapons will be right... The heavy tank range should fit size wise, the standard tank range has more of the weapons I'd like to see and then the Behemoth weapons are all arm hard points. I'm not sure how they'll look tacked on top of the Morrigu.
Suggestions, either on size or on alternative sources for weapons?
Guild Cerberus MRL Turret - Apocalypse Missile Launcher

Guild Exterminator Heavy Tank Turret - Vulcan Mega Bolter

Large Behemoth Triple Exterminator Cannon - Gatling Blaster

Large Behemoth Large Railgun - Volcano Cannon or Plasma Destructor
Images shamelessly stolen from the interwebs, not my work.