The final assembly follows my normal practice as seen in the other models on this site.  engine to chassis, Chassis to body, with each successive part hiding the assembly screws of the previous parts, with the final assembly screws disguised as actual parts of the whole.  Such as the inside door handles, used not to open the doors, but to actually hold the inside door panels in place.  The out side door handles do in fact operate hidden door catches that do open and click in place when the  door is closed.