Nice looking design... if I was doing an early-war mod, I'd definitely want to borrow it
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I do agree with Eder, though, that it looks more like a medium fighter than a heavy. So, I'd suggest calling it the Corsair - this was the fighter that was supposed to enter production just before the war. However, production was delayed due to political disputes regarding the location of the factory that would be making Corsairs. Presumably, the attack on McAuliffe would have cleared this dispute away, but it would still have been several months before the factory was ready, and then several more months before the fighter entered service. So, you're looking at late 2635/early 2636.
There is, however, a certain problem with making it a medium fighter - you have the perhaps not-so-desirable task of making it inferior to the Scimitar
. I would suggest making it like an early Rapier - that is, slightly more manoeuvrable and marginally faster (your 380 works fine) than the Scim, but with inferior armour, and virtually no shields. The lack of shields, BTW, would be a consequence of the time period - according to the WCP Guide, during the early years of the war, defensive technology on fighters was minimal. This means that the early-war fighters that we are familiar with, like the Scimitar and the Raptor, probably got their shields upgraded in the late '40s, and originally had almost none.
Finally, the question of guns. Well, if it's 2635, there's really only one option - the photon gun, which the KSaga manual describes as the most popular gun of that period, next to the laser. It's a pretty interesting weapon, too - double the range of the mass driver, but a higher refire delay, lower damage potential, and twice the energy usage. So, if this fighter had four such guns (although I would suggest removing two guns altogether), it would have good long-range damage potential (12.8cm at 4,500 metres), but could only fire off two or three volleys before its capacitators were drained.