Hey Sean,
I have a custom Thomas Rodriguez soprano ukulele that is made entirely of aged salvaged woods. Tommy is a renowned classical and flamenco guitar maker and has recently turned his hand to ukuleles.
The back and sides are hickory, and the top is red spruce, both of which came from 100 year old pianos. The Brazilian rosewood headstock overlay and the "golpe (tap) plate" that adorns the top was taken from a 1870's player piano veneer. The rosette is composed of maple, Brazilian rosewood and cherry, all of which also came from pianos, as did the rosewood fretboard and bridge.
I have been told that the quality of wood (due to its age) is much better than most "new growth" that is available today. Part of this is due to changes in the environment, as well as the sheer age of trees that are being harvested. Tommy has an amazing collection of wood that he has stockpiled from estate sales, historic property renovations, and other sources that he uses to build his instruments from.
Before I received it, the uke was featured at the Science Museum of Virginia for a few months. They had an exhibition about the guitar and stringed instruments, and the uke was on display as part of the event.
It sounds like a cannon and is a dream to play.
Here's a sound sample:
http://www.youtube.com/watch?v=ClUfgn58OMk
In the above demo the uke is strung with aquila strings. I've since changed them over to Martin fluorocarbons which I think makes for a smoother and, overall, a sweeter and more balanced tone.
Here are some pictures for you:
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