A plinth attachment system for attachment to at least one track, the system comprising: a track adapted to be installed in and run longitudinally, parallel to a centreline of an aircraft; a first plinth plate having a first side configured for mounting to the longitudinally extending track, and a first mounting feature (104, 112) for mounting a first structure; and a second plinth plate having a first side configured for mounting to the track, and a second mounting feature (104, 212) for mounting a second structure; wherein, when mounted on the track, at least one interlinking feature of the first side of the first plinth plate and at least one interlinking feature of the first side of the second plinth plate interlock at the track, and wherein, when mounted to the track, the first mounting feature (104, 112) and the second mounting feature (104, 212) are aligned at equivalent longitudinal positions; wherein the at least one interlinking feature of the first side of the first plinth plate comprises at least two first support plates extending laterally from the first side of the first plinth plate, wherein the at least one interlinking feature of the first side of the second plinth plate comprises at least two second support plates extending laterally from the first side of the second plinth plate, and wherein the at least two first support plates are interdigitated with the at least two second support plates; and wherein the first mounting feature comprises a circular central opening in the first plinth plate and a first pedestal, wherein the first pedestal is aligned above and surrounds the circular central opening and wherein the second mounting feature comprises a circular central opening in the second plinth pate and a second pedestal, wherein the second pedestal is aligned above and surrounds a circular central opening; characterized in that the first and the second pedestal each comprising a lower ring that attaches to the respective plinth plate (102, 202), an internal ring, an upper ring that attaches to the lower ring by way of the internal ring, rand connectors, wherein the lower ring, the internal ring and the upper ring are attached together by said connectors, wherein the lower ring, the internal ring, and the upper ring are aligned above and surround the respective circular central opening (112, 212). a track adapted to be installed in and run longitudinally, parallel to a centreline of an aircraft; a first plinth plate having a first side configured for mounting to the longitudinally extending track, and a first mounting feature (104, 112) for mounting a first structure; and a second plinth plate having a first side configured for mounting to the track, and a second mounting feature (104, 212) for mounting a second structure; wherein, when mounted on the track, at least one interlinking feature of the first side of the first plinth plate and at least one interlinking feature of the first side of the second plinth plate interlock at the track, and wherein, when mounted to the track, the first mounting feature (104, 112) and the second mounting feature (104, 212) are aligned at equivalent longitudinal positions; wherein the at least one interlinking feature of the first side of the first plinth plate comprises at least two first support plates extending laterally from the first side of the first plinth plate, wherein the at least one interlinking feature of the first side of the second plinth plate comprises at least two second support plates extending laterally from the first side of the second plinth plate, and wherein the at least two first support plates are interdigitated with the at least two second support plates; and wherein the first mounting feature comprises a circular central opening in the first plinth plate and a first pedestal, wherein the first pedestal is aligned above and surrounds the circular central opening and wherein the second mounting feature comprises a circular central opening in the second plinth pate and a second pedestal, wherein the second pedestal is aligned above and surrounds a circular central opening; characterized in that the first and the second pedestal each comprising a lower ring that attaches to the respective plinth plate (102, 202), an internal ring, an upper ring that attaches to the lower ring by way of the internal ring, rand connectors, wherein the lower ring, the internal ring and the upper ring are attached together by said connectors, wherein the lower ring, the internal ring, and the upper ring are aligned above and surround the respective circular central opening (112, 212).