Open. It's the main reason why I feel I need to be really tanky.
Then a
tanky Cutter. No other ship can carry 512t and be tanky, speedy and hardly mass-lockable
No point to use bi-weaves. You don't build a combat ship, but a trader that may be able to engage in combat, if the odds are good.
In case you engage in combat, you don't want to stay until your shields get depleted, so bail out when your shields drop to 1 line.
B-rated shields for some better integrity (thermal resistant, double braced) - in case your attacker brings torpedoes, they will need to hit you with 6 torpedoes to drop your shield generator.
2x MRP to have some decent module protection in case your shields get torpedoed
Reactive Hull with some 3xHRP for 5000+ hull after resists, notice the engineering and how the resistances get balanced - again as a safe measure if your shields get torpedoed
2 PDT, protection against hatch breaker limpets (you carry precious cargo) in slot 5 and 6 to cover only the bottom where the cargo hatch is.
Or you can put them in slots 6 and 8 to have protection both top and bottom arcs - they will be good against dumbfires and grom bombs, also against seekers and mines.
They will not be as good against torpedoes.
6 Shield boosters - 3x Heavy duty with supercapacitors and 3x Resistance Augumented also with supercapacitors - for 50%+ resists
3x Guardian shield boosters, to compensate a bit for the loss of shield strength due to thermal engineering on 6B shields.
Weapons of your choice - i went for lasers + mc,
2x long range medium turrets with emissive and scramble spectrum - to keep the target illuminated and to poke it at long range to prevent shield recharge.
2x efficient large laser turrets - main shield strippers, but the mc can help here too
3x gimbaled MC - main hull killers.
or,
An even more
shield-tanky Cutter
Still 512t cargo, but an 8B shield - thermal with double braced for 338 integrity - it will take 8 torpedoes to drop your shield generator (that's usually more than someone's willing to carry since normal shields drop in 4 torpedoes at most)
Also, the 8B will get you much better shields (7-8k after resists), but to have those shields and 512t cargo, hull will drop to 4000 after resists and there will also be a small penalty in jump range (still over 30ly ladden)
Tbh, i like second build more, but first one might have some better flexibility since you have more internals to play with (you are blocking only 2x size8 slots with cargo racks)
Edit: I would advise against SCB... basically every pvp-er will carry a rail with feedback cascade to cancel the SCB's so they will mostly waste slots.