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Bruno,

I have always located the transducer on the left side. I think the idea is there is less prop wash with a right hand propeller. I also have just screwed the transducer bracket directly on the transom. I do not know about making a starboard pad and gluing it to the transom. I have a picture on my personal page to show where my transducer is located. I have always kept the bottom of the transducer above the bottom of the boat just in case you hit something in the water. I am not sure how far that is off center. I also tape a ruler to the bottom of the boat right next to where I mount the transducer to get an idea of how much of the transducer will be in the water when the boat is on plain. The brackets usually have slots so you can move the transducer up or down a little. I have always erred on having the transducer lower than too high. Good luck with your project.