Interesting.
Is it just me or is there perhaps some striking similarities with this:

Although in this one, the engines are at the side pods and on Adv.Patcom the engine is at the rear block of the craft... and it is also bigger than this model, I think. Where did you say this model was originally from? Privateer 1?
Why, if I may ask, have you positioned primary weapons approximately ten metres apart from the center line? If you don't apply convergence, they'll be useless against anything smaller than 50 metres long ships - and if you apply convergence, the guns will be optimized at only one range. I would definitely pack some punch onto the centerline also; it would make it much easier to disarm targets when you could actually aim at the enemy turrets and missile launchers.