I used a Ram "C" size ball mount, with medium long arm and a universal fishfinder mount, on a track. I found some toilet bolts (LOL) that fit the track, drilled 2 holes in the RAM ball base, put a piece of rubber foam I had laying around, and that is how I attached the base to the track. It is stronger than the one they make for track. Plus, I already had it.
Battery is not shown, but goes in the front hatch. I used Anderson Power Pole connectors so I can un-snap the battery and bring it inside to charge it.
The Scotty transducer mount shown above is useless for Livescope, and I never liked it much - it is not streamlined and seems to make a lot of noise trolling along. I don't even really need the other transducer as once you go Livescope, you don't use the other modes much, if at all.
Anothe view of head mount
Powerpole connector. I later changed to an ATM type fuse.
So I used the youtube design and made a rotate-able Livescope mount, out of PVC. It works, but is not optimum. It drags in the water because I have the PLS transducer on a Summit Perspective mount, and that sticks out on one side of the tube and drags when I crank my TM over half-throttle. Also it turns too easy, and needs a friction thunb-screw. Or something. I did go out and catch some fish with it.