Hello Timothy Collinson,
During a discuss on another Traveller site someone mentioned the Lab Ship and I tried to recall where there I had seen specification for the hull. Checking both Traveller Bibliography copyright 1997-1999 and/or Traveller Periodical Bibliography copyright 2000 indexes for Lab Ship or Laboratory Ship. Both documents returned information on deck plans and or models which I do not have.
The Laboratory Ship is the location for Traveller Double Adventure 3: Death Station 1981 4th printing. Pages 11, 14 - 21 provide text information on the interior of the lab ship and pp. 12-13 has the summary information and deck plans.
Tom Rux