Good files, parts move smoothly. Could include slightly more documentation and instructions for assembly. I was able to figure it all out given some of the photos provided, though a few things to keep in mind: some parts need to be glued together, some need to be free moving, the pulley (mentioned it is not included) will go inside the square hollow bar, and the small gears are hidden inside of that bar which turn the pulley. Hope this helps for future users. I had a lot of fun putting the kit together. Great job overall! :)