I've made missile boats out of both the FGS and Type-10, and they can be a lot of fun. Something to think about for small hardpoints, you can get the advanced missile rack that pre-engineering has 64 ammo and is fixed only. I'm assuming it was an error that was never fixed, not sure, but that's a lot of spammable fire power out of a small.
With the FGS I put a thermal vent beam in the large, 4 seekers or pack-hounds in the mediums, then either pulse/mc or 2 mc for corrosive and emissive in the smalls, or just go with dumbfire in the smalls. Thermal vent and heat sinks are both nice to have if you are going ham with pack hounds.
My Type-10 is a hauler, so I only really fight off ships after me on missions, so I went with 2 large reverb torps (8 shots), 2 high cap large seekers, 2 beams and 1 pack hound in the mediums, and again corrosive mc and emissive pulse in the smalls. The beams are nice to have for shields in case I screw up the torpedo shots, otherwise it would be time to run, and they are thermal vent as well. I can usually have it cooled down enough by the time I get a target lock to where I don't need to pop a heat sink.