here's some images of the exterior of the battle platform prototype, Gustav Max:


sum stats:
2.6 million shields
500,000+ blocks
24 dual-barreled medium (500 block) lazer turrets
4 7-barreled flechette (650 block) lazer turrets
9 tri-barrled heavy (1000 block) lazer turrets

this is the main gun
it fires 49 AMCs at 350 damage each, meaning each individual shot has 900m range and can destroy hardened hull in one hit
it also has 49 missile launchers that does 144k damage per salvo and can cut a planet in half in one blast
that is the main gun