which size case are you using? Really like your set up.
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I did the Livescope installation inside a 30 quart Engels cooler. There's a YouTube video of a guy mounting a unit inside a magellan cooler. I copied mine similar to his. My transducer pole attaches to a D size ram mount on the side of my Bay Boat. Add another ram mount to your pontoon boat Orion 70 and you could switch between your boats.
Sorry but I have disassembled it and mounted it permanently in the boat. Looked back and couldn't find any pics of the inside of the box. I drilled two holes
just behind where the head unit is mounted for the power cable, network cable from the livescope black box and the Si/Di transducer, this also allowed it to breathe. Had a hole in the back for the cables to the transducers. Mounted the Blackbox on plastic standoffs to help with keeping it cool. After I had everything connected I just coiled the extra cables up neatly inside the box. I still have the box in my storage shed, I'll try to get you a pic of it.