I had a lot of fun with this mech. I would prefer to have more ammo, but I think the heat sinks are worth it rather than ammo. With this ammo load I managed a 1114 dmg game, You can just keep on firing and firing, pouring on ze damage, even on a hot map. I initially was running a dual MRM40, but going down to dual MRM30 I think is worth it. Still a solid punch but more staying power, the dual MRM40's got a little too hot and left precious little room for heat sinks. Skill tree I went with: https://kitlaan.gitlab.io/mwoskill/?p=jsonbin1.5a31ed60c175625da4a1c862#s=Weapons as you can see I think going for mobility is worth it.
Fun idea, fear the MAL is a bit too slow to properly get in MG range in general. If you do though, OHBOI. MRM40s have almost no ghostheat, and increase your damage while still closing in range.
4/5, Very fun Build. I play it with 6xHMG, MRM40x2 and 2xMedium Laser.and I have got very good result.