@DecidedlyNinja
Is it cheating if I used the Community Materials Pack? I created what is essentially a Teller-Ulam thermonuclear warhead. I made a fuel tank out of depleted uranium, filled it with 1 kt of deuterium, and strapped it to a nuke. The pack adds fusion reactions for deuterium in fuel tanks, but it's a little bugged, so it's way easier to initiate fusion than normal. But if you put one in a friendly fleet with the ship (b/c I can't get a missile through the CIWS) and detonate it manually, the ship goes to pieces.

Note that this behavior is probably a bug, since the nuke might actually be spawning INSIDE the ship.

@Tom Foolery
I would ask how you did it.

What if I were to tell you that I broke one of these in half?

NOTE: If game crashes while loading this, turn down the armour and other graphics settings.
If that doesn't work, then I can't help you that much.

This crashes the game whenever I try to start a sandbox with it.

Apophys new reactors radiate at 2500k, instead of armouring radiators, try having extra radiators, Boron Nitride is the best radiator material at these temps

2400 K. However, the radiators being covered with 100 cm of SiC makes them about one third as efficient as thin radiators. And 500 kt each.

that seems like a lot of radiators for 28GW, what's the outlet temp?

@Enderminion
I know it's not much. The trouble is, both Compensators were built for durability almost to the exclusion of all else. Half the MkII's dry mass is hull armor and almost all of the other half is radiator and internal armor, so it's not hard to beat it in mass and cost efficiency.

28GW is not much for a 61 megaton ship, my FOUR megaton ship has 280 gigawatts (thats what you get for running FIVE 252km/s railguns)

@Enderminion
Darn! My claims about the intentionally absurd ship are also absurd! However, I have a "good" reason to avoid the hybrid engine setup; doing low-acceleration maneuvers drives me nuts. This ship's poweplant "only" produces 28 GW for an awful lot of mass, so MPD acceleration would be slow indeed.

try RP-1 Denser and more thrusty

MPD NTR Combo drive, Dv AND acceleration. also Manhatten is sitting at 125 million (Imperial Short) tons

Freud would be proud

oh... my... god... still not as big as my 217 GM ship. but good job!