If you're bringing the SSD launcher then you definitely want the PWA, because that's what you'll use to identify rocks that have subsurface deposits.
If you've got Felicity unlocked now, one good use for those extra utility slots would be a pair of E-grade shield boosters. Out of the box, E-grade weigh almost nothing and use very little power, but also do almost nothing. However, Felicity can apply G1 Heavy Duty/Super Cap to them, and together they'll boost your shield strength by almost a third. And while you're there, its worthwhile to mod the power plant with either G1 Armored or G1 Low Emissions (depending on if you'd rather have a little extra power and slightly better heat efficiency, or sacrifice a little power for much better heat efficiency).
I wouldn't worry to much about PDTs personally - with that build, if anyone comes after your cargo you're going to want to run away very fast. NPC pirates at least usually shoot first, launch hatch breakers later. Similarly, I'm not too excited about the MC turrets. The AspX is blessed with forward, centrally mounted hardpoints - this makes for good convergence and coverage of targets in front of you. However, that means that enemies pursuing you will frequently be in the turrets' blind spots. If you have to turn to face a target to shoot them anyway, you'll get better damage just using gimballed guns instead. I'd go with a pair of gimballed MCs and a pair of gimballed pulse lasers. It's a classic loadout for a reason: mix of damage types, low power use, and (importantly for deep space operation) one of them doesn't have ammo that runs out.
