I really doubt you'll find that example. Simply because Walnut would not be a strong selling point in advertising. What sells is teak and mahogany, not walnut or oak, or any of the other woods that have been used in boat building.
Don't have time to browse ads right now, but I've seen many references to 'teak finish' (often a way to call laminate something other than laminate), teak veneer, etc.
You won't find walnut, because for good walnut a manufacturer would have nearly the same costs, without the common appeal of teak.
You could have the best and most expensive marine wood possible, and many buyers would consider it inferior simply because they 'know' teak is the best marine lumber.
Ken.
Public ignorance is also a factor. The amount of knowledge that most people have can be summed up by a statement made by one of my uncles woodworking friends, He said,"I know two kinds of wood pine and not pine". The variety of domestic hardwoods that are in demand all over the world is astonishing. Remember American oak in Europe is an exotic species. Here most wood workers don't know the difference between cherrybark oak and pin oak, but our ancestors did and they made the distinction when they selected wood for a project.
The reading of the wood species used in wagon construction is an education.
[SIZE=+2]HAVE you heard of the wonderful
one-hoss-shay,[/SIZE]
[SIZE=+2]That was built in
such a logical way[/SIZE]
[SIZE=+2]It ran a hundred years to a day,[/SIZE]
[SIZE=+2]And then, of a sudden, it--ah, but stay[/SIZE]
[SIZE=+2]I 'll tell you what happened without delay,[/SIZE]
[SIZE=+2]Scaring the
parson into fits,[/SIZE]
[SIZE=+2]Frightening people out of their wits,--[/SIZE]
[SIZE=+2]Have you ever heard of that, I say?[/SIZE]
[SIZE=+2]
Seventeen hundred and fifty-five,[/SIZE]
[SIZE=+2]
Georgius Secundus was then alive,--[/SIZE]
[SIZE=+2]
Snuffy old drone from the German hive;[/SIZE]
[SIZE=+2]
That was the year when Lisbon-town[/SIZE]
[SIZE=+2]Saw the earth open and gulp her down,[/SIZE]
[SIZE=+2]
And Braddock's army was [URL="http://www.ibiblio.org/eldritch/owh/shay.html#brown"]done so brown,[/URL][/SIZE]
[SIZE=+2]Left without a scalp to its crown.[/SIZE]
[SIZE=+2]It was on
the terrible earthquake-day[/SIZE]
[SIZE=+2]That the
Deacon finished the
one-hoss-shay.[/SIZE]
[SIZE=+2]Now in building of
chaises, I tell you what,[/SIZE]
[SIZE=+2]There is always
somewhere a weakest spot,--[/SIZE]
[SIZE=+2]In hub, tire,
felloe, in spring or
thill,[/SIZE]
[SIZE=+2]In panel, or crossbar, or floor, or sill,[/SIZE]
[SIZE=+2]

[/SIZE]
[SIZE=+2]In screw, bolt,
thoroughbrace,--lurking still,[/SIZE]
[SIZE=+2]Find it somewhere you must and will,--[/SIZE]
[SIZE=+2]Above or below, or within or without,--[/SIZE]
[SIZE=+2]
And that's the reason, beyond a doubt,[/SIZE]
[SIZE=+2]A chaise breaks down, but does n't wear out.[/SIZE]
[SIZE=+2]But the
Deacon swore (as Deacons do,[/SIZE]
[SIZE=+2]With an
"I dew vum," or an "I tell
yeou,"[/SIZE]
[SIZE=+2]He would build one shay to beat the
taown[/SIZE]
[SIZE=+2]'n' the
keounty 'n' all the
kentry raoun';[/SIZE]
[SIZE=+2]It should be so built that it
couldn' break daown![/SIZE]
[SIZE=+2]--"Fur," said the Deacon, "t 's mighty plain [/SIZE]
[SIZE=+2]Thut the weakes' place mus' stan' the strain; [/SIZE]
[SIZE=+2]'n' the way t' fix it,
uz I maintain,[/SIZE]
[SIZE=+2]Is only jest[/SIZE]
[SIZE=+2]T' make that place uz strong uz the rest."[/SIZE]
[SIZE=+2]So the Deacon inquired of the village folk [/SIZE]
[SIZE=+2]Where he could find the strongest oak, [/SIZE]
[SIZE=+2]That could n't be split nor bent nor broke,--[/SIZE]
[SIZE=+2]

[/SIZE]
[SIZE=+2]That was for spokes and floor and sills;[/SIZE]
[SIZE=+2]He sent for
lancewood to make the
thills;[/SIZE]
[SIZE=+2]The crossbars were ash, from the straightest trees,[/SIZE]
[SIZE=+2]The panels of whitewood, that cuts like cheese,[/SIZE]
[SIZE=+2]But lasts like iron for things like these; [/SIZE]
[SIZE=+2]The hubs of logs from the "Settler's
ellum,"[/SIZE]
[SIZE=+2]Last of its timber,--they could n't sell 'em,[/SIZE]
[SIZE=+2]Never an axe had seen their chips,[/SIZE]
[SIZE=+2]
And the wedges flew from between their lips[/SIZE]
[SIZE=+2]Their blunt ends frizzled like celery-tips[/SIZE][SIZE=+2];[/SIZE]
[SIZE=+2]Step and prop-iron, bolt and screw,[/SIZE]
[SIZE=+2]Spring, tire, axle, and
linchpin too,[/SIZE]
[SIZE=+2]Steel of the finest, bright and blue;[/SIZE]
[SIZE=+2]
Thoroughbrace bison-skin, thick and wide;[/SIZE]
[SIZE=+2]
Boot, top,
dasher, from tough old hide[/SIZE]
[SIZE=+2]Found in the pit when the tanner died.[/SIZE]
[SIZE=+2]

[/SIZE]
[SIZE=+2]That was the way he "put her through."[/SIZE]
[SIZE=+2]"There!" said the Deacon, "naow she 'll dew."[/SIZE]
[SIZE=+2]Do! I tell you, I rather guess[/SIZE]
[SIZE=+2]She was a wonder, and nothing less![/SIZE]
http://www.ibiblio.org/eldritch/owh/shay.html