This build completely avoids ghostheat, has quite good speed, a decent alfa, decent range and can manage to keep on shooting indefinitely without overheating thanks to the LBX-10s, but has lower DPS and thankfully it does spread less damage at shorter ranges. You also have a nice -10% missile heatgen quirk, which will help a lot. With ammo skills, it will have ammo to spare (1080 MuRMs [18 alfas] and 72 LBX shots [36 alfas], which means 1080 + 720 damage). You can lower the engine rating up to 280 (50.4 km/h is my lowest recommended speed), drop the light-ferro-fibrous and add some other ammo or an AMS on your arm. Spoiler: Why the name "Kactuar"? Like the MAL-2P "King Tonberry", Kactuar is a Final Fantasy recurring monster. You will fire 80 pellets/missiles and each one will deal 1 damage... So you have a "80 needles" attack, which was the original name I came up with.