Warthog,
It seems to me you achieved what Capt. Chuck did. He just used the transducer itself for the mold or "box" and that is how I have been installing them for 20 plus years. Cut the hole thru the hull as close as a fit as possible,grind the area around the cut out,wipe the area with acetone,insert the transducer and secure with some type of putty making sure that it protrudes from the bottom about 1/8" to 1/4",glass over with alternating mats and biax or woven rovings etc. run the nut down to seat on the glass you have laid,then go to the bottom and run a bead of 5200 or gelcoat putty around the tx ducer,you do not need to do all of the fairing of the bottom that you did on yours. I have installed hundreds this way and have gotten consistently good bottom reads at speeds of over 40 mph depending on the boats hull type and transducer location without a single failure or problem for over 20 years. Just my two cents worth!
