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Compensator-Class (SuperUltraMegaUberDreadnought)

(That little speck in the thumbnail? That's a Gunship. This ship is easily the most absurd and unusable thing I've ever made, but I had fun with it. Be warned, because your framerate will not survive.)

A group of apparently underworked Ninja Aerospace engineers dreamed up this ship to, by all indications, stave off boredom. While the resulting plans are totally useless, the ship they describe is rather impressive. It is 3.56 kilometers long, armed with a planet-killing 649 gigatons of nuclear ordnance, and built about as sturdily as a mountain. The cost is something of a barrier to its production, however.

Mass: 154,000 kt (slightly large)
Cost: 4,730,000 Mc (you could probably buy Jupiter for this)
dV: 1.24 km/s (so getting it around will require a few tankers)
Propellant: more or less all of the methane that has ever existed

Armor: Two layers of two meters of beta titanium each, separated by ten meters of nitrile rubber. I have tried everything up to throwing a 6 kt Civetta-class battlecruiser into this at 3.48 km/s, and still haven't even penetrated the outer layer.

Ordnance:
--1000x Keres II fireship: Converted capital ships with their crew sections replaced with nuclear bombs. LOTS of nuclear bombs. Each ship/missile/drone has a yield of 649 megatons, enough to kill a fleet, and a decent set of guns. 8.74 km/s dV ensures the enemy can't escape.

Kinetic:
--10x 1 GW 80mm superheavy MAC: A big coilgun taking advantage of bugs to launch an 8 kg slug at 9.92 km/s, giving a 393 megajoule impact energy. Slow rate of fire, though.
--20x 100 MW 9.8mm railgun "Sidewinder": The big brother of the main guns on many NA ships, firing 15 g slugs at 10.1 km/s.