Actually... if we do some math
the body is doubled sideways as well as lengthwise
so 2*2 = approximatly 4 times the volume of a slave1
either he used more than 2 Slave1s to build it, or added extra bricks in the right colors.
You're right, I used some extra parts.
My goal was to use the parts that came with the Slaves since my inventory of new Gray isn't very good but luckily the hull is a hollowed-out cargo bay which helps. I will admit the ship is pretty heavy and especially when I compare its weight to the offcial Slave 1.