Lazorfaust technically says lazorfist if Wikipedia can be trusted so that is what I am going with. This could be a command mech....possibly long range fire support, say to be paired with a self tagging LRM boat. Though it has SRM6 they are only there in case something dose get close you get that extra 30dmg that you can blast them with to finish them off. This is a very hot mech...4 large lasers generate no small amount of heat but if you manage it correctly It can be a good thing I promise you .
My humble take on Lazorfaust Drops the SRM altogether, switches Gauss for AC20 and adds heaps of DHS.
Taking off the SRMs you can use Gauss or AC/20 to great effect. Depends whether you want more punch up close or far away. Even with them, you have a lot of punch. If you're doing 4xLL, those are your primary weapon and your ballistic/missile are either complementary or backup. It makes more sense to devote tonnage to DHS than it does to bigger secondary weapons, so I lke Vorkoz's redo.
taking off the srms is a great idea, it actually raises your sustained dps a lot. if you want to go for gauss i would use this: 18 heat sinks (if you want you can trade a hs for more ammo), 325 Standard Machine