By moving one of the LPLs to the right torso and a ML to the left torso, and dropping the engine down to a 310 XL, you can fit an extra DHS. LPLs and Mediums combine very well together (especially on IS Mechs). I really like this design!
4/5, I ran a similar build, but TBH it is too much hot for my taste. Despite the "-10% laser heat gen" quirk, that extra medium laser won't allow you to alfa strike two times in a row without shutting down... Anyway, "Skribs" alternative is pretty good, but I would personally prefer to have a better engine on this mech. You can drop a DHS for a 325XL or better, or even go for a 350XL and 19 HS if you strip some armor.