I have now made a Bob Lane Cup - Clone out of two different materials. I made the first one out of some of my thin aluminum. It was however, 1/32" thick and after attaching the two pieces together I couldn't open the cup.
I then got out a piece of a thin plastic material (.020") I have called "Styrene" and made a second Lane Cup. This one does open and only weighs 13 grams / 0.46 ounces. The down side is that it leaks, drip, drip, drip, drip. It might be possible to tweak the pattern to reduce the leaking situation.
I plan to make at least two more test cups, one out of 0.010 aluminum and one out of 0.010 Stainless Steel.
The question for me now becomes "if I add a cup like this to my gear list" how do I plan to use it? If I want to drink out of it, my first version plastic cup leaks to much. If I only want to use it as a scope to get water from a creek or spring to put in a water filter, water bottle or other water container, then the fact that it leaks may not be that important.
At 0.46 ounce the plastic cup might be light enough to add to my gear list but it has to have a "real" job. Adding a cup like this to my gear list would only work for me if I don't have anything else to scope water with.