DWF-PRIME 2xCUAC20 + 6xCMPL
It's not quite an alpha beast since you can't alpha, but within the span of about two seconds it can deal 128 damage and maybe another 64 a second later with a cool shot. I used UAC20 range/CD and MPL range so the effective range is around 380-400m which isn't too bad.
I grouped up 3 MPL + 1 UAC20 on left click and another 3+1 on right click. I also have separate groups for each UAC20 (for heat management) and the MPLs (for things I'm not confident of hitting with UACs). So I just double tap left click for 64 damage, wait half a second and double tap right click for another 64 damage. Heat isn't as bad as I thought and I managed to stay in a fight for quite awhile.
Not the best build in the world, but it's damn fun when the UACs don't jam. Firing discipline required for maximum enjoyment. Also you can probably instantly kill any light mech that stands still for two seconds with just half your guns.
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The tarcom's there to increase the UAC velocity and make it easier to hit with, but if it's not a big deal for you then you can probably do without it.
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