[cctbxbb] crystal packing/unit cell question

I am new to cctbx and crystallography in general. I am trying to take a pdb file and produce a representation of the crystal, similar to the symmetry mates produced in pymol. I have used cctbx to apply the symmetry operators, but this gives atomic coordinates that are quite spread out. I think what I want to do is to fill the unit cell, or in some way extract crystal packing information. I would like, in the end, to be able to build files with a physically realistic representation of different sized crystals, so I can go on to study the interactions of molecules within those crystals. Is there a way to do this in cctbx? Thanks! Jessica