I pulled the fabric covered earpiece cable through the hole that the original cable came from.

A ziptie around the cable will prevent it from getting pulled out or straining any of the connections if th earpiece is dropped. I added a zip tie pad to prevent pushing the cable in to the phone from causing any issues with the rotating generator next next to where the hole is.

I printed the fake batteries and shells to make sure they fit. The shells screw on and will be covered by ~2mm of plastic.