The new boat I'm thinking of buying is a deep vee. At the bottom of the
vee, as it were, is a small flat "pad." The pad serves several functions
which I won't get into here.

Thus, if you look at the stern of the boat from outside the hull, you
see a shape sort of like this:

\_/

The pad is about three inches wide. On the inside of the boat, a piece
of marine ply is epoxied to the fiberglass hull, and then the ply is
fiberglassed. Attached to the fiberglass is the bilge pump and its float.

There is room right there to drill through the hull bottom and install
a straight shooting down fishfinder/depthfinder/temp gauge transducer.
We'd make the ply circle hole a bit larger than the transducer and then
epoxy the ply edges, just for insurance.

The question is this: would a through hull like this be "mo' betta'"
than the usual stern mount transducer in terms of accuracy? There are
several transducers available that barely protrude from the bottom, so I
am not worried about interfering with the stream of water hitting the
engine's lower unit under water. Do through hull transducers tend to
fail at a higher rate than transom mounts? Are there other
considerations I should ponder?

Price is not an issue: there's really not much difference in pricing
between a good transom mount and the through hull.

Thanks.