After extensive research and testing, the quest for the ultimate search for high performance, high precision stacking rail has been found -- using industrial rails. This type rail is an off the shelf rail and is widely used in industrial automation. Best of all, there are plenty of surplus supply of this rail on eBay for reasonable price. This kit offers what are needed to convert this type of rail into a stacking rail for its precision and stability. Here are list of included components
 
1x Camera mount block
2x Base stand to mount the rail on other surfaces such as 2080 aluminum T-slot boards 
1x Nema 17 motor mount plate
1x Aluminum Coupler
1x Nema 17, bi-polar 400 steps/rev precision step motor
1x Camera quick release clamp and plate.
1  set of allen wrenches
1  set of necessary stainless screws.
 
Options: If the rail you purchased does not have the carriage block, it is available for purchase. If you need to mount this rail on a 2080 T-slot board, it is also available.