Thx much for the replies. I'm putting in a forward facing Garmin Panoptix transducet and thickness of the hull is something I don't want to "guess" about. E-Sea Going, thx much for your answer.
Also, I don't have a spare table saw to carry with me, so I'm cutting the fairing block before I haul.
Now, my main depth info quit (comes from an old Ray unit (last of the old stuff, so now looking at a glue in the hull transducer to get depth. Don't need fishing stuff. (but may change my mind if I get hungry).
Anyone have good experienc with the glue in the hull transducers?