A method of referencing points in an aircraft, comprising: placing a first measurement device proximate a first door of the aircraft; placing a second measurement device proximate a second door of the aircraft; determining a position of the second measurement device relative to a position of the first measurement device; characterized in that the method further comprises: placing a first plurality of reflective devices inside the aircraft proximate the first door wherein the first plurality of reflective devices are in a first optical path with the first measurement device; placing a second plurality of reflective devices inside the aircraft proximate the second door wherein the second plurality of reflective devices are in a second optical path with the second measurement device; measuring first distances from the first measurement device to the first plurality of reflective devices; measuring second distances from the second measurement device to the second plurality of reflective devices; and based on a determined position of the second measurement device and further based on the first distances and second distances, determining third distances between each of the first plurality of reflective devices and each of the second plurality of reflective devices, wherein the third distances provide a measurement baseline for a plurality of points on at least one of a fuselage and wings of the aircraft. placing a first measurement device proximate a first door of the aircraft; placing a second measurement device proximate a second door of the aircraft; determining a position of the second measurement device relative to a position of the first measurement device; characterized in that the method further comprises: placing a first plurality of reflective devices inside the aircraft proximate the first door wherein the first plurality of reflective devices are in a first optical path with the first measurement device; placing a second plurality of reflective devices inside the aircraft proximate the second door wherein the second plurality of reflective devices are in a second optical path with the second measurement device; measuring first distances from the first measurement device to the first plurality of reflective devices; measuring second distances from the second measurement device to the second plurality of reflective devices; and based on a determined position of the second measurement device and further based on the first distances and second distances, determining third distances between each of the first plurality of reflective devices and each of the second plurality of reflective devices, wherein the third distances provide a measurement baseline for a plurality of points on at least one of a fuselage and wings of the aircraft. placing a first plurality of reflective devices inside the aircraft proximate the first door wherein the first plurality of reflective devices are in a first optical path with the first measurement device; placing a second plurality of reflective devices inside the aircraft proximate the second door wherein the second plurality of reflective devices are in a second optical path with the second measurement device; measuring first distances from the first measurement device to the first plurality of reflective devices; measuring second distances from the second measurement device to the second plurality of reflective devices; and based on a determined position of the second measurement device and further based on the first distances and second distances, determining third distances between each of the first plurality of reflective devices and each of the second plurality of reflective devices, wherein the third distances provide a measurement baseline for a plurality of points on at least one of a fuselage and wings of the aircraft.