I think that the sidewinder with shield vampire, mirror images and system hardening was pretty much the best thing that could be made before the new parts were added, but is this still the case? What ship loadout are you running?
If most enemies don't survive the first salvo, do you really need the extra power generation? Seems like an Auxiliary Battery would be better. (50 > 15*3)I'm currently using 3 Power Core Tuners and 2 Extra Weapon Mounts that add up to 5 equipped Quad Howitzer Turrets on the Sidewinder. Only the Ova'lek and the gabilani pirate's ship enemy ship encounter survive the first barrage because of their higher than usual evasion stat/base health pool. Most other ships don't make it to the fifth howitzer salvo, which is nice.
'Oops, All Howitzers' fares well, I assume.The Space Leviathan ship encounter seems to be a great way to test builds, with turn 6 being the desired number of turns to take to defeat the thingy.