CF would be great though durable, strong, light, and it doesn't interfere with WiFi and cell signals.
Are you sure? I know that carbon fiber and 2.4ghz radio signals can be a bad combination. RC aircraft flyers have to take precautions to make sure their radio signals don't get blocked by receivers in carbon fiber fuselages.
I don't know about WiFi or cellular signals. I'm sure it all has to do with what the frequency is and carbon fiber does absorb the signals from some radio frequencies.