 In 1624 Landvogt Joseph Plepp drew the first precise drawings and plans of the castle, which at the time had more the appearance of a fortified farmhouse.His plans formed the basis for plans to expand it into a fortress.As the first step, in 1625 a double curtain wall and double gatehouse were constructed in a new position in the north section and the height of the earthen embankments on the east and south sides was increased.