Heavy corvette/antiship destroyer: the raised section is the brige (similar in size/shape to that of the newer Kilrathi Corvettes, the stubs to either side of that would be quad turrets or some such, the twin booms are either torp launchers 2*quad tubes for salvo launches or just 8 seperate) or 2 axis-mounted AMGs (NOT turrets). Space under the bridge can be used as a torp bay (dropdown rotary?) or space for a couple CSMs.
Antifighter: quad lasers or dual tachyons on the stubs (or use them as advanced targeting systems...), singles or lasers scattered over the rest except for the prow, those twin booms are *big* VLS systems housing perhaps 100-200 missiles each and firing them at a scary rate.
Carrier (doesnt look like it has enough hangar space for a full flight wing unless you make it Vesuvii-size, making a strike/escort instead): not that much internal space, things are going to be CRAMPED... central bay is small, and there are tractor beams mounted around the booms (all sides, base and tip) to facilitate landing and possibly inhibit impact of undesirable projectiles. Laser, mass driver, and/or Stormfire turrets in similar placing on the midesctions of the booms (suiciding is a BAD idea here...). Fighters are stored in and launched from individual drop-bays in the booms or from small catapults in the blocks to the side of the booms (drop bays preferred because the ships can actually be STORED there and launched on short notice with little hassle).
Battlecruiser/Star Destroyer/Ship o' Doom
this could get really fun and/or really obscenely powerful... forgive me.
-Twin booms. Macross. Need I say more? (happy to explain if I do)
-PTC in each of the booms, "shotgun" array of AMGs in the center recess... yeah. Right.
-for real now... the stubs are missile turrets, 12 tubes in each (actually 2 sets of 6), reloaded automatically. Multiple CSM launchers in the center section, 3 AMG/Plasma in each of the boom ends, boom is covered in a gauntlet of antifighter turrets, secondary phase shield generators located somewhere that is really annoying to get at... sounds fairly reasonable. Perhaps a half dozen fixed AMGs mouned down each side, enabling this ship to punch through enemy capship formations and deliver broadsides... engines look huge so whatever powers this thing must be putting out a *lot* of juice.