I designed my prototype to change pictures with out the frame ever having to be removed form the wall. I did most my research inside the store “lowes” seeing what looks best and getting to see how the tracks work. I used wood ply and studs cause it would me it strong and sturdy. And using a metal track. My process was research then design them gather materials then build. The track worked and the picture sliders worked great along with the stoppers. Testing this all out was adequate. My prototype is not exactly how my final version will look. Its too big of a piece for me. What be different in the end is the height of the project. I learned having everything planed out while making your sketches of your project and foreseeing problems on paper, will help you out a lot.