So I'm thinking a LR Terminus Ultra would look like this in net epic:
Move 20cm, Save 2+, CAF +3, Twin Lascannons Attack Dice 3 To-Hit 5+ TSM -2, Lascannons Attack Dice 2 To-Hit 5+ TSM -1. And unlike the normal LR it does not have Troop Transport nor PD.

The question is, what's a fair cost for this variant?

And I assume only the Ultramarines use this variant.