Strong lensing studies can provide detailed mass maps of the inner regions even in dynamically active galaxy clusters. Proper modelling of the intracluster medium can play an important role. We discuss a parametric method which exploits X-ray and optical observations. The mass model accounts separately for cluster-sized dark matter halos, galaxies and the intracluster medium. This gives an unbiased look at each matter component. The method has been applied to AC 114, an irregular X-ray cluster. The dark matter distribution is shifted and rotated with respect to the gas but follows the galaxy density, which hints at its collisionless nature. Despite the dynamical activity, the matter distribution seems to be in agreement with predictions from N-body simulations. A universal cusped profile provides a good description of either the overall or the dark matter distribution and the cluster is not affected by the lensing over-concentration bias, as further stressed by an analysis of the triaxial structure.