This is my 3D-Printed RC Tugboat.
I will upload a video to my youtube chanel and add it here.
Print the walls thick enough, so no water can enter through tiny gaps in the wall.
In the cabine is a hohle, where you can unplug the battery from the ESC. If this is
not used, you can glue the hatch. If you have a switch you can screw it under the
stair in the window.
If you use PLA to print the boat, I can recommend to glue the hull with silicone.
If there are any questions just ask!