@ Mor:
My missile FACs wouldn't be simply upscaled fighters even if both use box launchers.
I like a single big missile on 150-300t fighters. Enemy will be limited by number of fire controls rather than number of PD weapons, may as well make use of this.
If I multiply everything including fire controls, I gain very little but am much easier to spot and shoot at. If I don't... as the target was limited by fire controls, I lose the salvo dispersion that made it work.
If I make box launcher FACs, they tend to carry numerous smaller missiles, often size 1 (AMM, ASM or dual purpose). If we rely on volume rather than dispersion, we benefit from less overhead in fire controls.
For boarding craft: When carrier-based, fighters are definitely an option. If I want a cryo drop module, decent deployment time and enough engines to safely board semi-crippled ships, 500t are insufficient.