I’m going to toss in an untested (for this use) idea. Cut out silhouettes of your tools from black construction paper or black poster board, scan in the silhouettes, then the shapes can be auto-converted to paths in a variety of tools including Inkscape. In a number of situations I’ve had to 3D model something that has to mate with a real world item. Photographs with their perspective/parallax frequently have problems, but doing a 2D cutout and scanning the result gets the job done.
Note that you can scan and then convert multiple cutouts at the same time. You might even be able to stretch that idea and place all the cutouts on white poster board in the configuration you want for your final case, carefully photograph the result, and then convert the whole pattern in one go.
Again, untested, but it is what occurred to me when I read your post yesterday.