Yes, you read that correctly. The Thorax as full on DPS shield-tank brawler. It looks like this:
[Thorax, Shield Ganker]
Damage Control II
Magnetic Field Stabilizer II
Magnetic Field Stabilizer II
Magnetic Field Stabilizer II
Nanofiber Internal Structure II
Experimental 10MN Microwarpdrive I
Large Shield Extender II
Adaptive Invulnerability Field II
Warp Scrambler II
Heavy Ion Blaster II, Void M
Heavy Ion Blaster II, Void M
Heavy Ion Blaster II, Void M
Heavy Ion Blaster II, Void M
Heavy Ion Blaster II, Void M
Medium Core Defense Field Extender I
Medium Core Defense Field Extender I
Medium Anti-EM Screen Reinforcer I
There is nothing subtle to this ship. With your Nanofiber Internal Structure and your Microwarpdrive, you achieve speeds at which you can outrun some frigates. You use that to charge your enemy, hold them with the warp scrambler and beat them down with blasters. I have left drones out of the setup because they are really up to you. You can use some damage drones, but a flight of Vespa EC-600 drones are also not a bad idea in case you need to break the lock of someone pointing you. Honestly, you don't need much extra damage anyway. This ship can achieve up to 540 DPS with good weapon skills and volley damage in excess of 1300. With a handful of such Thoraxes warping in on an enemy, you will blow things up quickly.
There are shield Vexor fits that can have more DPS than this Thorax, but when it comes to directly applied raw damage, nothing in the same ship class outperforms the Thorax except one, the Moa:
[Moa, Blaster Moa]
Damage Control II
Magnetic Field Stabilizer II
Magnetic Field Stabilizer II
Magnetic Field Stabilizer II
Experimental 10MN Microwarpdrive I
Adaptive Invulnerability Field II
Stasis Webifier II
Warp Scrambler II
Large Shield Extender II
Heavy Neutron Blaster II, Void M
Heavy Neutron Blaster II, Void M
Heavy Neutron Blaster II, Void M
Heavy Neutron Blaster II, Void M
Heavy Neutron Blaster II, Void M
Medium Ancillary Current Router I
Medium Anti-EM Screen Reinforcer I
Medium Core Defense Field Extender I
Because the Moa has a naturally higher shield capacity and resist, you can get away with fitting less defense and still get more effective hitpoints than the Thorax. While the Thorax is not bad at all with it's 22-23K EHP, the Moa can easily get 25-29K depending on your skills. With tank in the same range, you can free up a rig slot which makes it possible to put that Ancillary Current Router there and fit Neutron Blasters, and then things get really nasty. Now we are talking DPS of up to 570 and volley damage of almost 1700 maximum.
If you like more heavily tanked stuff, stick to Ion Blasters and put an extra Defense Field Extender on there instead. This will push your effective hitpoints well beyond the 30K mark but you do sacrifice about 30DPS and a significant amount of volley damage. You will still have the same damage output as the Thorax. So when comparing the two ships on the tank/gank scale, the Moa can either have better EHP and much higher damage than the Thorax, or it can have similar damage and much stronger tank than the other ship.
The Moa has one significant disadvantage when compared to the Thorax: It's speed. At comparable skill levels, the Moa will be a good 600m/s slower than the Thorax. Closing in on fast targets will definitely be more difficult, so it's better to have a ship like this warp in at close range and start shooting. To prevent the opponent from pulling range, you fit that webifier in the midslot. This serves a second purpose too: The Moa lacks the tracking bonus of the Thorax, so you will need a way to prevent your opponent from running circles around you and avoid most of the incoming damage. When it comes to drones, the same goes for the Moa as for the Thorax: ECM can be more useful here than damage.
Variations of both fits exist which substitute Tracking Enhancers for Magnetic Field Stabilizers to get more range and make sure you can hit your target for full damage more often. Personally, I am not sure whether that matters much if you are close and always stay fixed on your opponent instead of orbiting them. Also, the Thorax has a built-in tracking bonus already.
In the end, I didn't call those ships shield gankers for nothing. They are not built for fancy maneuvering but for warping in on a target and blowing them to bits as quickly as possible. One caveat for both: Stay away from opponents with energy neutralizers. They will quickly shut your propulsion, your resistance and your turrets down. Again ECM drones can save your life in that case.
Have fun blowing up things.