The Maloch (pg 58) is 25,000 ton with a fight bay of 3,000 ton's, crew of 119 (I think) and the Lankor (pg 60)is 75,000 ton fight bay of 7,000 ton, crew of 245 (I think). I am not to sure on the crew as the crew quarters sections of the read outs I have always found a bit confusing and I did not include the cryo chambers info in my crew estimates above.
That can be a real problem if some of the core ships do not jive with the construction rules and I know that has been a problem in the past with some other games.
MDC