In this paper, we discuss in the framework of a mechanoelastic model the electronic and mech. behavior of a single layer of spin crossover mols. self-organized on a substrate. We consider the mols. situated in a face-centered-cubic structure interacting in between and with sites in the substrate by the way of connecting springs with given elastic constants The main exptl. results are reproduced, i.e., typical thermal transitions with their incompleteness of the hysteresis loop, residual fractions after low-temperature relaxations, cooperativity, or kinetic features. However, we prove that the simple model, implying fixed neighbors on the substrate for every spin crossover mol., leads in some cases to unphys. situations, corresponding to unexpected large curvatures of the spin crossover layer. Therefore, to go further, we allow every spin crossover mol. to change its adsorption site on the substrate at every moment, by connecting to the closest mols. on the substrate. This approach, corroborated with the use of different densities of the sites on the substrate, allows us to simulate further exptl. observations, such as the appearance of cracks inside the layer or periodic arrangements of apparent heights of spin crossover mols. on the layer leading to moiré patterns, for which exptl. data are also provided.