The 5A power plant you have doesn't give you that much power to work with, so you'll either want to change the mod on it to overcharged (use the lowest grade you can get away with) or upgrade it to a 6A. If you upgrade to a 6A, I would recommend using armoured + thermal spread.
For the hull, there are a few options you can go for depending on how much money, materials, and jump range you are willing to sacrifice:
Additionally, if you are willing to sacrifice the SRV, you can put your choice of a MRP or HRP in the size 2 slot. If you go with the HRP you could either go with heavy duty + deep plating for an extra 360 hitpoints and better resists, or you could go with thermal resist + deep plating and combine it with reactive bulkheads with
lightweight + deep plating or
heavy duty + deep plating for even more hull integrity.
For shields, bi-weaves work best when you are expecting to face lots of enemies in quick succession, but aren't as good if you're only expecting to get attacked once every few minutes. I'd recommend using prismatics if you have them, otherwise use an A-rated shield. You probably don't need the second point defence, so you can swap out one of them for a second shield booster. I think Northpin had a pretty good shield setup (reinforced + hi-cap generator, 1 heavy duty + super cap booster, 1 thermal + super cap booster) that you could use for a prismatic or regular A-rated shield. Northpin also used a 2D Guardian shield booster in place of the SRV, but you may have already decided to put a HRP/MRP there or just decided to keep the SRV.
I can't think of any weapons that would be useful to put in the remaining large hardpoint that would allow you to take on NPC pirates that come after your stuff, let alone another player who is trying to kill you with no regards for your cargo. As other people have said, if you get interdicted by another player, your best bet is to run and not try to faff about with mines or anything. You aren't going to have enough firepower to take NPC pirates down by yourself, so no matter what you do you're going to need to rely on system security showing up to help. To this end, you only need to do a small amount of damage to the pirate to summon system security, meaning your mining lasers are actually somewhat useful in this type of engagement if you can get close enough to use them (there was one time I got interdicted by a NPC pirate Anaconda and managed to collect the bounty on it in my T9 with nothing but a pair of small mining lasers and a small fleet of system security). That said, mining lasers aren't particularly good for tagging ships and summoning system security, so you can put whatever weapon you feel comfortable using in this slot.
I had a recent break then logged in a few days ago. FDL interdicted me 7 times on the way to SD. Scratched my paint.
