An apartment building for 6537 kerbals. Launch mass of 53 kilotons. 165 mammoths. Youll have around 2000-2500m/s of Delta V in orbit, depending on your gravity turn. Be very patient when loading this craft, it can take a while.
It can be landed on other celestial bodies if you find a perfectly flat spot, even the slightest gradient will lead to one corner taking all of the 6-10 kilotons of the station and will scatter the 400 fueltanks across the terrain instantly.
Built in the SPH in KSP version 1.7.0.