Re: How big were TWOK's "cargo bays" Khan spoke of?
Logically, they recovered the Botany Bay and took it apart to give Khan and his followers the maximum amount of raw material to use to survive. This was supplemented by supplies and cargo from the Enterprise. There would be lots of crossover of material as they built stuff.
"What are you going to do?"
"I don't know. I'm making this up as I go."