Some comments on the materials used
The key concept in building the Youthalele is the use of craft plywood for much of the body construction. For the most part, I have used Midwest Products 1/8” thick birch plywood, but there are other materials out there. Door skins, 1/8” thick are a possibility. Also Midwest products also makes birch plywood in 1/16” thickness. It is more expensive than the 1/8” ply, but it makes a superior sound board. That said, you will need to brace the thinner top appropriate to the size of the ukulele. I have some on order and want to further explore using it for the top and sides. As cost was the primary consideration in the first design, I have not worked much with it yet.
You also need wood for the neck, fretboard and bridge. Walnut is a good wood for the fretboard and bridge. It is fairly easy to find some shorter 1”x3” flatsawn pieces. You can slice off the edge for a glued up fretboard and same idea for the bridge. Any mahogany, fir, cedar or even pine can be used for the neck and end blocks.
Fretwire, tuners and nut/saddle blanks can be ordered via Stew-Mac or LMI. You can also search Amazon or EBay for cheaper options. I recommend using the original Titebond for glue.
Coming up next, I will talk about tools.
Brad