Researcher André Douzet has previously suggested that the maquette actually shows Rennes-Le-Château (see here for an extract from his book which gives an overview of his thinking with regards the model: http://perillos.com/model.html ).

However, Callum Jensen (aka The Green Dan) has now ingeniously argued that the model can be much more convincingly shown to represent Lincoln. Read Callum's full article here: http://farshores.org/a07lc.htm.