The camera slider is a perfect example of the advantages of MakerSlide: as it combines structural support and linear motion in one piece, it is simple and cost-effective. It is also very sturdy.
The kit includes all mechanical components. The list of parts and the assembly instructions are available the Amber Spyglass wiki.
In order to build and use this kit, you also need a NEMA14 or NEMA17 stepper motor, some wire, and a driver and control electronics. One possibility is an Arduino Uno as a controller, with a GAUPS stepper shield, and a Pololu stepper motor driver (or this one, or this one).
You need a way to attach the camera to the moving carriage plate, and the MakerSlide to two tripods. We carry both 1/4" and 3/8" screws that can be used to attach a camera, a quick-release mechanism, or a ball head to the plate. We don't have a ready-made means of attaching the MakerSlide to the tripods, but we're working on a mounting plate with a 1/4" threaded hole. It will be available as a separate item. In the meantime, as a simple solution for attaching a quick-release plate to MakerSlide, you can remove the 1/4" screw and replace it with a M5 screw and a T-slot insertion nut.
The 1 m, 1.5 m, and 2 m options include a length of MakerSlide and the appropriate length of GT2 belt (100 mm longer than the rail). The No Rail option includes neither MakerSlide nor any belt: you will have to purchase the belt separately.