The only way of having useful missile build for PvP is to have 2-4 engineered torps and rest - Pack Hounds with increased capacity. What you do is launch Packs Hounds to hide Torps from PD, destroy shield gen and then finish off target by module sniping and possibly ramming, lol. This build is used for surprise attacks and pirating mostly, but fun meme build. Although any half decent PvPer in any medium ship will be able to avoid it and render you completely unable to fire and lock.
Seen some very good SR hulltank FGS shotgun builds. But the thing is, you have to be godlike with FA-off. Unless you are, piloting any FGS build in PVP will be doomed for quick and gruesome death.