Yes, the Slave 2 is one of these. Yes, the Slave 2 is missing the starboard side wing, strut and reactor. Yes, this is deliberate.
The Pursuer is a extended loitre capable extreme speed interceptor. The gigantic (for a ship this size) SIR can power the engines to very high velocities, whilst also powering the main guns, which occupy almost the entire front third of the fuselage.