I started a prototype live load coal car last fall and during the design progression I started modifying the Berkshire Valley Models ore cars that I had. Only when I had a car design almost completed, did I realize that it wouldn't work. The mechanism would hit the trucks! I had not paid close attention to the depth of this car compared to my scratch built car. During the build, I had taken two of my already built kits and modified them.... only to learn that it wouldn't work!!! I boxed them up in frustration and set them aside.
Today I finished three new cars and had time to go back and look at this previous design. With some modifications, I think I can make it work.......
Sometimes it pays to set things aside, work on another project and come back with a new perspective. At least, I find this often works for me.