So, here comes posting No. 2 to increase my counter.
Someone suggested to get hold of the stability booklet.
Another respondent mentioned that it might contain a body plan.
Well, though the stability booklet does indeed comprise information that is highly interesting to the naval architect (mind you, the hydrostatics can be seen as a kind of numerical representation of the hull lines),
I am afraid it usually does not contain a body plan.
However, its so called "curves of form", tabulated vs. immersion of draft, reveal hydrostatic particulars that can indeed be helpful in reconstructing the hull lines.
One such property that comes to mind would for sure be the displacement and the centers of buoyancy.
Apart from that it mainly consists of tabulated tank and hold capacities with their centers of gravity.
Based on the curves of form (viz. metacentric height or radius as well as vertical center of buoyancy) and the centers of gravity for different loading conditions the cross stability for those cases can be calculated.
Graphically the cross stability is depicted as lever arm curves for typical loading conditions of the vessel during the voyage as well as for the the docking case
that show up to what angle of heel there will be a positive lever arm for the buoyancy force to upright the vessel again.
Additionally, the so called "cross curves of stability" are provided for master and ship mate to extend (semi-graphical) calculations for the not elaborated loading cases.
Of course, similar information is given for trim calculations and longitudinal stability, which however often is not as critical as traverse stability
but whose forces could become critical for other types of vessels such as bulkers as far as bending stresses are concerned.
And often, especially on pax vessels, a whole chapter is devoted to damage stability.
I don't know if the stability booklet gives any advice to the master how to handle the vessel in following seas that travel from behind at a dispersion speed similar to that of the vessel and have a wavelength close to the vessel's length.
Especially, fishing vessels have been prone to capsize in such conditions with many losses of lives.
