Step 6: The Almost-Final Product
The large binder clip provides a quick and easy means of securing the hinged diffuser sheet. The small binder clips are what will eventually hold the light shield to the assembly.
Unintended side benefit: I was going to cut off the part of the camera mount that projected beyond the negative holder but I was lazy and left it long. I later found that when I opened the diffuser sheet, the extension supported it perfectly and reduced stress on the hinges.