IS spin-off on the TBR-S build I posted. Not as durable due to IS XL engines and doesn't have quite the punch because of the lack of ppc splash and erml's but still works just fine. I know the fear of Gauss in the same torso as an XL but if it goes your most likely dead anyway lol.
There's some crit space unused, an engine downgrade costs 4kph, but adds a DHS and a JJ (or alt ammo), as the 3D feels a bit clumsy with only two JJs after the recent patch.