This piece is complicated, but I've done what I can to make it easy assembly. The tower will raise and lower, spin 360 degrees and slide on the turntable carriage. For accurate rigging refer to images on google by typing in Watson 2500 and you should be able to get the idea. This piece is designed to fit onto a triple axle truck. The hydraulic cylinders will need some sanding and fitting to ensure operation. Should there be an issue, contact me via the shapeways link or via email to modelmechanic@gmail.com.