Having received the specifications in November 1936, DAF immediately began the third project, the "Pantrado 3", a somewhat larger vehicle than the "Pantrado 2". Construction of a boiler plate demonstrator vehicle was begun in the spring of 1937. The construction process was inspected in May by the Dutch prime minister Hendrik Colijn who at the time was also interim minister of defence. DAF submitted the first blueprints and a scale model to the commission in July. These showed a number of deviations from the specifications: the design dispensed with the track option entirely and was a pure armoured car. The front wheels were not driven and normal rubber tyres were used. In August 1937 the commission advised that a single prototype would be ordered; Van Doorne and Van der Trappen had indicated that the demonstrator vehicle was in an advanced stage of manufacture and could quickly be completed as an official prototype.