At the end of last year, Nick Tito, Kees Storm and myself published a paper in Macromolecules in which we propose a numerical approach to analyze the statistical mechanics of polymer networks. Starting from just the topology, specifying which nodes are connected by a polymer strand, without assuming anything about the geometry, the method converges onto the full probability density for the positions of the nodes, and provides a good estimate of the free energy of the network as a function of deformation parameters.
See the paper in Macromolecules here.