Here is a modular ice shuttle that all the parts printed on an MK3S+. Its parts were designed in tinker cad. I used Petg for everything with 3-4 walls and 30% gyroid infill. Supports are only needed for the transducer holder.
Just about all the hardware is stainless ¼-20. For the handle, I used a piece of ¼-20 all thread, with a piece of ½" EMT slid over it.
You will need a strip of velcro that's about ½" wide. It goes through the battery holder and wraps around the battery.
I used Kenntha's Lowrance HDS 7 Full Size Mount https://www.thingiverse.com/thing:5191633
The transducer arm was from Builder_Ben https://www.thingiverse.com/thing:3277661/files
Glow Cup remix https://www.printables.com/model/300748-uv-glow-ring-for-modular-ice-shuttle
TPU Cable Stopper https://www.printables.com/model/274504-cable-stopper-for-lowrance-ice-transducer
Ice Rod Holder https://www.printables.com/model/301571-ice-rod-holder-for-modular-ice-shuttle
Edit 1/21/24 - added a thinner upright.
The author marked this model as their own original creation.