Here is a pic I took of my system with the Transducer mounted inside the kayak shooting thru the hull using Electrical Putty.
It works, I'm sure if the ducer was in the water there would be a lot more detail, but it works. At this point it becomes up to you, whether or not losing a little detail it that big of a deal for you. I purposely did this because I wanted to see if it could be done, and it can, yes, even with Side imaging it can shoot thru the hull.