Looks good except you need to extend it at the top so you can tape or zip tie the earphone cord to the shaft, to keep it coming straight out of the main cylinder, doing this you can avoid down time and costly repairs. Good luck!
2 cents for what its worth.
Run coil wire straight away to at least coupler height... with enough slack for full movement of coil.
Strap with NON metal clip Zip Tie or Velcro strap.
Now...
About that map you have hanging in the background.
Any way I could see a nice picture of it ?
I've seen some photos with the controller facing to left and some facing the right. Any comments on which works best?
Nice looking setup! Makes for some good treasure hunting!