Planetcracker Class Battleship

The planetcracker was designed as a cruiser killer, a massive ship with enough armament to swat an entire fleet. They were roughly seven kilometers long and had to be assembled in orbit in separate sections. With a maximum thrust of 1G it could not escape the surface of a variety of planets, and any approach would have to be done at slow speeds. Any crew transfers would have to be done from a station, orbital elevator, or dropship.
With the massive size of the first planetcrackers came enormous problems. Construction was frequently delayed by inferior or insufficient workers and materials, and intricate engineering problems arose further lowering the speed of production. Of the eight ships first laid down only four were starworthy at the start of the Orion War.
The first ship, the Gigantia nailed the functional design, with weapon, reactor, and defensive placement barely changing between her and her sister ships. However the internals such as the bridge, crew quarters, and storage spaces would drastically change from ship to ship. Crews likewise constantly changed. With such a large vessel the crews were enormous, often on the same scale as a planetary base or small regiment. As such the logistics of the vessel necessitated a fleet of supporting tenders on prolonged voyages.
They were however perfect weapons for destroying orbital forts.
Fourteen Planetcracker Class battleships were made, with twelve surviving the war. The Gigantia is kept in the

Power Generation

7 Custom Nuclear Reactors

Propulsion

5 Nuclear powered Xenon motors, numerous xenon thrusters for precision manoeuvring

Weapons & Armament

20 Phase III Tubes with collective magazine for 60 weapons. 240 Mark 5 tubes with 8 weapons each, used for close-in defence.

Armor and defense

161 point defence lasers. 3000mm of ceramic composite armour all round. 10,000mm of ceramic composite in specific locations.

Communication Tools & Systems

SPAR-Fibre Mod 1
Later upgraded to XTAR-Fibre Mod 1

Sensors

Six VIS3 IFR6 systems bow, stern, and along the beam, each with a hardened backup system
Later Upgraded to VIS4 IFR20 with better acquisition picture
Two MAG1 systems in the bow and stern
Later Upgraded to MAG5 with greatly increased sensor range and sensitivity

Additional & auxiliary systems

Fire Control System 4 Mod 4, later upgraded to FCS7 Mod 2
Auxilliary Sensor System 1 Mod 1 Installed halfway through the war to link together the separate sensors together to drastically increase acquisition speed and quality
Later upgraded to ASS 3 Mod 2

Hangars & docked vessels

Hangars for Sixteen Zeus Dropships or equivalent. Storage capacity for ninety six exosuits, sixteen additional platoons of marines, or sufficient cargo space, to fill those dropships.

Manufacturer

Sumnian Armed Forces

Owning Organization

Sumnian Navy

Rarity

14 ships completed, 12 surviving

Beam

1km port to starboard

Length

7km bow to stern

Height

1km fin to keel

Complement / Crew

9800 sailors, 200 orbital marines