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How would i go about doing this? Do i just attach CML to Cataphractii Terminators or what?

Yup.
Here are some good ones
http://www.spellcrow.com/blizzard-missile-launchers-p-305.html

Something like that. Also worth considering coming up with some sort of physical representation of the Peritarch Tageter; I'm imagining a camera/sensor-pack structure that lives between the Cyclone launcher pods/just generally on top of the model (for autocannon squads).

The Iliastus Pattern Assault Cannon kit from Forge world includes 2x unique heads with extra optics.

This could be an overly expensive way of doing it, but if you really wanted to represent the Peritrach Targeter that could be a way of doing it.

Personally I would be takin them all with Reaper Autocannons just because it looks different

 hotsauceman1 wrote:
Yup.
Here are some good ones
http://www.spellcrow.com/blizzard-missile-launchers-p-305.html

As a fellow ultramarine player I went this route as well.
I posted a short look at these very missile launchers on my youtube channel.

I made my Tyrant Siege terminators with the upgrade kit from Anvil Industries: http://anvilindustry.co.uk/Shoulder-Missile-Launcher