A method for transporting build components in a manufacturing assembly line using an automated guided cart AGC, the method comprising the steps of: - defining a cart path (60;78) with a guide path device, - placing an AGC in communication with the guide path device; - selectively moving the AGC along the cart path (60;78) - said method being characterized in that it further includes the following steps: - providing the AGC with a plurality of precision attachment points and a plurality of locator pads (170, 176); engaging a support structure (240,300,314) carrying at least one product build component, with one or more of the plurality of precision attachment points of said AGC, - providing a predetermined first location with a docking station arranged along said cart path (60,78), proximate a build operation area including a robot or other automated equipment, the docking station including precision locating roller (226, 230), - stopping the AGC at said docking station of the predetermined first location arranged along said cart path (60,78), wherein when stopped, the precision locating rollers (226, 230) of the docking station are in contact with the plurality of locator pads (170, 176) of the AGC; - precisely dimensionally positioning the support structure (240, 300, 314) at the docking station of said first location to carry out a build by the process automated equipment on the product build component, wherein the precision of the positioning of the support structure (240, 300, 314), is obtained by the following further steps: the plurality of the precision attachment points are designed to be precisely and accurately located in three-dimensional space relative to other portions of the AGC, and the locator pads (170, 176) are precision located relative to the precision attachment points of the AGC. - defining a cart path (60;78) with a guide path device, - placing an AGC in communication with the guide path device; - selectively moving the AGC along the cart path (60;78) - said method being characterized in that it further includes the following steps: - providing the AGC with a plurality of precision attachment points and a plurality of locator pads (170, 176); - providing a predetermined first location with a docking station arranged along said cart path (60,78), proximate a build operation area including a robot or other automated equipment, the docking station including precision locating roller (226, 230), - stopping the AGC at said docking station of the predetermined first location arranged along said cart path (60,78), wherein when stopped, the precision locating rollers (226, 230) of the docking station are in contact with the plurality of locator pads (170, 176) of the AGC; - precisely dimensionally positioning the support structure (240, 300, 314) at the docking station of said first location to carry out a build by the process automated equipment on the product build component, the plurality of the precision attachment points are designed to be precisely and accurately located in three-dimensional space relative to other portions of the AGC, and the locator pads (170, 176) are precision located relative to the precision attachment points of the AGC.