I'm glad to hear that you have found SasView to be of some potential use.  To answer your second question first, The paracrystal model functions (as with all models in SasView) are analytical solutions to the I(Q) expected from such a structure given a lattice parameter, distortion factor and the object forming the "nodes" of that crystal. If you click help on the fit page with that model selected you will be taken to the documentation for the model which describes the equation that is being fit and includes the references to the original papers from whence the model was coded... assuming I am understanding your question correctly.

The answer to the first question is that there is no way within SasView that I know of to directly feed the output of those fits and create a 3D real space image of the crystal. I would think however that from the outputs you could construct such a thing? I assume there is software that can take the crystal parameters and generate such a structure? If you happen to have the 3D structure (i.e. the positions of all the atoms in space), you could use the general scattering calculator (under the tools menu) to generate the expected scattering pattern.  I'm not sure how well it works however for something where the "atoms" are actually objects on the length scale that themselves scatter in the q range we are computing?

I hope this helps .. .or at least answers your questions? If I've misinterpreted the question please let us know.

Good luck and stay safe

Paul Butler