If there is ever gonna be a MRM-centric meta, it will look something like this. Better cooling compared to 2xMRM30, no ghost heat, good speed, asymmetrical build that actually can make good use of this mech's geometry and hitboxes, good quirks (-5% laser duration, -10% missile heat, +10% energy range). Best used as med-short ranged brawler (~150 meterish) so you can focus fire even with those MRMs. ALT: STD300 version with TC1. Slightly hotter, but with maxed armor and you can actually shield with the side with less weapons without worrying too much about speed and cooling loss. Previous builds can be shifted to the 4N variant: Energy Cooldown − 5 %, Energy Range + 5 %, Missile Cooldown − 10 %
I don't think 900 ammo is enough. That's only 15 salvos, 18 with skills. Ah yes, Ghost heat. Do you know that if you fire two MRM 40 at once, it produces only 1.61 ghost heat, for a total of 24.61? That's less than if you were to chain fire 2 MRM 30 + 1 MRM 20. It's only .61 heat more than chainfiring 4 x MRM 20. You can run MRM80 and 6 medium lasers, but you'll be too hot to brawl. I suggest dropping some medium lasers, giving you something like this: or with a light engine:
18 salvos are enough for me: I think it is a decent estimate if I assume I need 3 alpha strike (or at least 3 MRM strikes) to kill any target, so it would be 6 solo kills before I run out of ammo (or ~81 seconds of non stop firing)... That's a lot of exposure and damage taken if I can't manage to get a free trade. Ghost heat calculus was really interesting, but I would not give up any MLs due to the fact you could need some pinpoint damage at medium range (e.g. fast light harassing you)... Despite that, you can mount everything on the arms, which is actually a good thing. Or you can simply keep the 6xML and rely on MRM because of the heat gen quirk
I run my Stalker 3FB with 2xMRM30, 6xMLAS, and ECM! Spoopy Stalker..... Can confirm it melts face, though.