I worked on the forearm case for my Drip-Boy today! I took measurements of my left forearm using a digital caliper, and I CAD-ed all the dimensions into a tube (with filleted edges). I’ll glue some padding on in real life. I incorporated two hinges on the back (you can’t see them in the image). You’ll need to insert two #6-32 screws for them to work. I fastened the Raspberry Pi case onto the bottom, though I need to CAD a release mechanism for it because I’d like to be able to put it in/take it out. I still need to figure out how to attach the screen and wiring.