The model, coming from the Royal Palace of Caserta, documents the architectural conformation of the Royal Palace at the beginning of the nineteenth century, before the massive restorations commissioned by Ferdinand II. It is configured as a model for transformation design studies and preparatory, probably, to the first draft of the Great Project by Antonio Niccolini to which the artefact, datable to 1811, refers.

The original block of the Old and New Palaces is contrasted by the bulk of the eighteenth-century "Braccio Nuovo" which, in line with the main courtyard, closes the south facade: here was the apartment of Carolina Murat with access from a new staircase to four stretches, of which the compartment can be glimpsed, and connected to the terrace whose extension is not reproduced in the model. Inside is represented the Queen's Theater, later transformed by Gaetano Genovese into a Ballroom, in which reproductions of painted sets, actually performed by Niccolini, are visible. The hanging garden connects the uneven buildings of the southern front, among which the seventeenth-century pavilion of the Belvedere stands out. The passage between the courtyard of the Belvedere and that of the carriages takes place through a small loggia on pillars, while the original perspective connections of the fontanian project are now reduced to small openings between the courtyards.