I can see the pictures now.
The trailer is looking good as well. Did you eliminate the side markers? Are those fenders strong enough to stand on? One thing that I've always wanted to do with the trailer is to add some guides because getting it centered is a bit of a pain (especially when alone).
Here are the pics of the Hummingbird install. The first one is the very rear of the bilge looking down as if you were standing on the seats. (The rear deck has been removed.) To the right is the bilge pump switch and you can barely see the light coming through the bilge plug hole. The second shows the placement of the display on the console and the power switch.
Full disclosure, this is a new and untested install. The old unit worked well for 10 years but the display gave out. The old unit had a round transducer with two wires, the new one has three so I had to replace the transducer as well. The old unit working at speed is no guarantee that this one will too but I'm pretty confident that it will. It will probably be at least a couple of months before I can get it on the water to test.
I like the placement of the display because it's easy to glance at while at speed. I wish that I'd centered it a bit better and that it was 1/4" lower. You'll notice on that section of the console, it gradually curves away until it becomes flat at the top. To completely seal the display bezel, you need about 1/2" of flat above the mounting hole. I didn't get quite enough so the bezel doesn't seal as well as it should.
I powered it be tapping into the thick always hot line in the console. (The new line has it's own fuse.) It's nice to be able to turn it on when the boat isn't powered but it's easy to forget to turn off. One could eliminate the switch by adding a relay using the gauge lights as a signal wire. That way it would still be on it's own power circuit but would turn on/off with the boat.
If you decide to install, here is my take on how it should be done.
1) Remove the rear deck lid. I did the first one with the lid in place but it was a bit uncomfortable reaching back in there from the front. It was _much_ easier reaching in from the back.
2) Remove the starboard water box
3) Clean the area thoroughly
4) Clean it again. (Seriously, it must be clean and dry)
5) Dry fit the transducer. It must be flat and the entire thing must contact the hull. Try to get it as far back as you can since that area maintains the best contact with the water.
6) Find something heavy to weigh down the transducer and work out how to get it to stay. It's better to think of this now than when the epoxy is laid down.
7) Carefully mix a whole syringe thing of slow cure epoxy. Try to avoid introducing air bubbles. Air between the transducer and the hull will introduce false readings. It's slow cure so you have plenty of time. I've found that a bit of parchment baking paper makes a good mixing surface.
8) Lay a thick coat of the epoxy on the hull.
9) Back butter the transducer
10) Wait a bit to allow any air bubbles to work there way out of the epoxy
11) Place the transducer giving it a few small twists to make sure that it has full contact with the epoxy
12) Weigh it down and allow to cure as per the epoxy instructions.
13) The next day, run the wire to the console. I went straight up, then to the starboard and then back. That kept it out of the way. It'll be easier with the throttles pulled out of their hole.
That's it. It's not as hard as I make it sound.
Rob