A slipform paving machine, comprising: a machine frame; a plurality of ground engaging units for supporting the slipform paving machine from a ground surface; a plurality of height adjustable machine frame supports supporting the machine frame from the plurality of ground engaging units, each of the machine frame supports including a machine frame support actuator configured to adjust a height of the machine frame relative to a respective one of the ground engaging units; an offset mold including: a mold frame; a mold form configured to form at least one surface of a molded structure; and a mold form actuator configured to adjust a position of the mold form relative to the mold frame; at least one external reference sensor configured to provide a signal representative of a position of the slipform paving machine relative to an external reference system; and a controller configured to: receive the signal from the at least one external reference sensor; and control a position of the mold form actuator to control the position of the mold form relative to the mold frame and thereby control a position of the at least one surface of the molded structure relative to the ground surface at least in part in response to the signal from the at least one external reference sensor and based at least in part on target values corresponding to a user selected profile for the at least one surface of the molded structure, the mold form being configured to form a top surface or an interior surface of the molded structure, wherein the at least one external reference sensor is part of a three-dimensional guidance system including one or more GPS sensors or is part of a total station providing a signal representative of a position of the slipform paving machine relative to an external reference system. a machine frame; a plurality of ground engaging units for supporting the slipform paving machine from a ground surface; a plurality of height adjustable machine frame supports supporting the machine frame from the plurality of ground engaging units, each of the machine frame supports including a machine frame support actuator configured to adjust a height of the machine frame relative to a respective one of the ground engaging units; an offset mold including: a mold frame; a mold form configured to form at least one surface of a molded structure; and a mold form actuator configured to adjust a position of the mold form relative to the mold frame; a mold frame; a mold form configured to form at least one surface of a molded structure; and a mold form actuator configured to adjust a position of the mold form relative to the mold frame; at least one external reference sensor configured to provide a signal representative of a position of the slipform paving machine relative to an external reference system; and a controller configured to: receive the signal from the at least one external reference sensor; and control a position of the mold form actuator to control the position of the mold form relative to the mold frame and thereby control a position of the at least one surface of the molded structure relative to the ground surface at least in part in response to the signal from the at least one external reference sensor and based at least in part on target values corresponding to a user selected profile for the at least one surface of the molded structure, the mold form being configured to form a top surface or an interior surface of the molded structure, wherein the at least one external reference sensor is part of a three-dimensional guidance system including one or more GPS sensors or is part of a total station providing a signal representative of a position of the slipform paving machine relative to an external reference system. receive the signal from the at least one external reference sensor; and control a position of the mold form actuator to control the position of the mold form relative to the mold frame and thereby control a position of the at least one surface of the molded structure relative to the ground surface at least in part in response to the signal from the at least one external reference sensor and based at least in part on target values corresponding to a user selected profile for the at least one surface of the molded structure, the mold form being configured to form a top surface or an interior surface of the molded structure, wherein the at least one external reference sensor is part of a three-dimensional guidance system including one or more GPS sensors or is part of a total station providing a signal representative of a position of the slipform paving machine relative to an external reference system.