After some long time of testing i decided to stick to traditional navy weapon positioning.
Also i`ve finished the majority of UIN small and medium weapons:
small:1. 2-pdr gun - a cheap kinetic cannon with very long range (~900)
2. 2-pdr dual - more expensive kinetic cannon.
3. 6-pdr assault gun - a HE weapon with decent power and fire rate.
4. vickers defence gun - a very accurate machinegun weapon.
5. bofors defence gun - a slow firing flak that deals 40 points of frag damage. Long range.
6. pulsar torpedo - 1 shot launcher for a torp with 1500 HE damage and emp damage.
medium:1. 2-pdr quad gun - fires 4 shots of basic 2-pdr rounds.
2. 6-pdr assault autocannon - expensive weapon that fires bursts of 6-pdr rounds.
3. 10-pdr assaul cannon - moderate weapon that deals he damage.
4. rapier defence system - CIWS analogue, but with greater accuracy and much lower rate of fire.
5. bofors defence battery - literally 4 bofors moulded togethr. Expensive and deadly, fires a burst of 4 shots.
6. particle cannon - energy weapon with a very long range, but slow moving projectile.
7. particle pulse cannon - expensive version of particle cannon. Fires 4 shots, has reduced range and longer charge-up.
8. particle beam - unlike particle cannon this beam deals kinetic damage.
9. pulsar torpedo launcher - fires a burst of 3 torps.
large:1. heavy massdriver - very fast moving projectile dealing kinetic damage. Accurate and has a very long range. Drawbacks - long reload and charge up.
2. terminator autocannon (just a sprite so far) - deadly auto-firing weapon that shots 10-pdr projectiles.
Just to note:
ALL factions will have their battleships use some kind of built_in weapons. RSF are going to have two 3-barreled 408 siege cannons, ISA - a plasma-burst cannons (auto-fire), UIN - a pair of gauss cannons, XLE - a powerful beam array (with convergeonpointer flag).