The camera slider is available again.  The new version includes the belt and the belt pulley, which the old one didn’t.  All you need is a motor (we have those), electronics (we have those too), a way to attach a camera to the slider (we have 1/4″ and 3/8″ tripod-type screws), and a way to attach the slider to two tripods (working on this one).

I plan to make a thick aluminium or acetal (Delrin) plate, say 60 mm by 40 mm, with four holes in the corners and an 1/4 inch 20 TPI threaded hole in the middle.  It would bolt to the back of MakerSlide, and the central hole would take a standard tripod screw.