The perovskite-like family of ammonium formate frameworks AB(HCO2)3, where A is a divalent metal ion and B is an (alkyl)ammonium or guanadinium, is of great interest for its potential multiferroic properties. We intend to characterise the (anti)ferroelectric order-disorder transition of the compounds A = Mn, B = ND4+ or ND2(CD3)2+ by reverse Monte Carlo modelling of total neutron diffraction data. These data will allow us to model the local structural changes across the transition, in particular the distortions in framework structure as the guests freeze into their low-temperature positions. Furthermore, we will characterise any correlations or cooperativity between adjacent guest sites. Modelling the dynamical effects responsible for the electric phase transition in these frameworks will be an important step towards the aim of producing multiferroics by design.