It looks like a trip to AC Moore or Michael's might get some of what you need.
The thickness of the brass might be about 1/16" or even thinner, perhaps 1-2mm, depending on where you live. Hobby stores sell strips of this.
A handle might be confiscated from an old suitcase.
You can cut and glue a lensboard from the hobby wood, which is like Baltic birch or something, that is available at Michael's. Cut it with a back saw, two pieces, one smaller than the other so they fit together in the front standard, and glue them together, let dry, then make the hole for the lens. You can sand/stain them, or paint if you can live without fancy wood.
There are some cool cabinet knobs available that might be of the right brass style for you in home hardware stores, or check McMaster.com for industrial hardware. They take small orders.
Good luck with your project.