Well, here's an idea that may help you. I had a depth finder that I wanted to make portable, so I mounted the flasher unit on the bottom side of a five gallon bucket, and put a lawn mower battery in the bottom of the bucket. I could then turn the lid over and the whole thing could be carried with the bucket handle. As far as the transducer was concerned, I ran the lead wire up through a piece of PVC pipe which I sealed with silicone seal to the top of the transducer and around the wire at the top end of the PVC. I added a couple of small diameter nylon ties to attach it to the side of my boats, and it just floated along side, tied to the gunnal rails or oar locks. Kinda looked like an oversized bobber of sorts. Worked very well, and could be manually "aimed" for checking out surrounding pockets. (Had to remember to pull it out of the water tho, for running at high speed.)

If you are into making a fashion statement, however, you may want to disregard this post.

happy fishin'