When I joined the saucer sections,there was a wicked gap.I rejected the use of putty for fear of damaging/clogging the fiber optics so I cut a thin plastic strip that I clamped around the edge with mini binder clips.The instructions would have you putty over the wires running down the engine supports but I feared that the wires would be damaged so I cut brass u channel and glued them over the wires.The insulation is intact so the engine lights will not short out.The internal wiring of the main hull looks really tricky so extra care/study will be taken there.