If you are experianced in building model cars then you will always have these sort of things. Every kit i have built there have been 1 issue or another and the durango was no different. As long as you build the car making sure parts arn't binding and are free moving you won't have many problems. Any problems that you will have are easily sorted out and people on this thread and other threads will help you sort it.
"pin not going through slipper assembly cover"
File or dremmel the ends of the pin removing any burrs.