If hardpoints stay somewhat similar to the ones seen in MWO, there are some pretty nice options for the KGC-0000. I really don't like the original loadout, because it is useless after 5-8 salvos.
closest to the original: drop the LRM15, add 2nd LL and 3 tons of ammo for the AC20s.
I'd prefer to downgrade AC20s to AC10s, LL to 4 MLs, max armor and make it 2 tons of ammo for each weapon. (2 AC10s + 4 tons, 4 MLs, 1 LRM15 + 2tons)
The Beast: 2 AC5s + 4 tons of ammo, 4 MLs, 3 SRM6s + 4 tons of ammo, 19 HS, max armor (that's a stunning 370dmg per alphastrike)
or
The oversized, jump-capable Orion: 1 AC10 + 2 tons, 4 MLs, 1 SRM6 + 1 ton, 1 LRM15 + 2 tons, 17 HS, 4 JJs, max armor (might be a decent allrounder)
or
The Dakkapult: AC5+2tons, 4 MLs, 3 LRM15s+6tons, 17 HS, standard armor
And yes. I do like MLs over AC20s.