My favorite role to play in nearly any BT game is the "heavy cavalry." The mech that has the movement to get where you need it to be, and the power to kill what you need to die when it gets there. Before the cataphract, I've had to make do with the HBK-4SP, which while it is a fine chassis is lacking in the armor department for my chosen role.
After seeing the player Memory running a CTF-2X build similar to this one, I decided I had to give an XL engine a try. before I used the XL, I used an AC20 in my ballistic slot, but I find its shot velocity is too slow to be able to brawl effectively so I switched to a gauss for better brawling capability (ironic, I know). There's also the fact that an AC20 won't fit in the side torso with an XL. Two SRM6 packs in the left arm give a vicious close-range punch, especially because the limited number of tubes in the launcher keeps the missiles from spreading a lot. They have a spread similar to an SRM4 pack, rather than an SRM6, and come out in two flights. A pair of medium lasers gives ammo independence, and can add pinpoint damage to supplement the shotgun effect of the SRM launchers. The final build is as follows:
CTF-2X
upgrades: endo steel, double heat sinks
engine: 340 XL
RA: medium laser
RT: gauss rifle, two tons ammo
CT two tons gauss ammo
LT: medium laser, AMS, 1 ton AMS ammo, 3 tons SRM ammo, beagle (experimenting with the BAP, can swap it out for more heat sinks)
LA: 2x SRM6
Armor: 416 points, torso armor slightly shifted to front, armor slightly shaved from arms and legs.
The gauss rifle is heat-efficient enough that you don't really need any more than the 10 base DHS.
The proof is in the pudding:
![Posted Image](http://i.imgur.com/0MB0x.jpg)