Abstract: An apparatus and process for assembling interior components in an aircraft fuselage. A rotating laser is utilized with at least three reference targets and at least one associated part locating target. The reference targets are located in the fuselage and the rotating laser unit establishes a reference plane based on those targets. After establishing the reference plane, a part to be installed is put in approximately its final location and the lasers are used to locate the part based on the at least one attached target for each plane. A control and analysis system is provided in order to properly determine whether the part is in its appropriate position.