There's a patent in place for the last one...one of my moonshot regs.....currently the term is "electronic assembler" hopefully it will change in the future to the above with the uptake of 3D printing/manufacturing and robotics.....
actually, it's always a safe choice to use digi otr digital word in the domain. makes it more easy to remember. If you want something digital-related domain. I think this is a safe choice, just make the other word easy to remember.