"just" 265k mass.The Prometheus is not as big as it seems, 500m length but it has just 265k mass with turrets and docked ships.
The most time was figuring out the new weapon systems and building new turrets, i also spent quite some time designing a nice blinking logik but i had to scale it down a lot (it was not working as i had initially planed) .
Pics from the hangars:
12 light fighter:
2 heavy fighter and the escape pod docks (8):
1 light corvette:
2 shuttles:
2 engineering vessels and 2 courier vessels:
That's a medium-heavy titan according to my classification. :D