Step 1: Material List
The size of the parts vary with your own individual design. And the meassurements are all in millimeters(mm). If you need it in inches, you have to multiply the millimeters with a factor of 0,03937. So 1mm equals 0,03937 inches.
What to buy(more or less):
2 x thin wood lathes (60 x 5 x 100)
1 x thin wood lathe (10 x 20 x 100)
1 x thick wood lathe (60 x 20 x 100)
1 x thin large sheet of chipboard
2 x sticks (diameter = 10mm, length = 1000mm)
4 x strings
4 x machine heads for the strings
14 x frets
If you're not familiar with the metric system, here's a little cheat-list:
1 meter(m) = 100 centimeter(cm)
1 cm = 10 millimeters(mm)
Step 2: Bending the Wood for the shape, Part 1
Another way of making the wood soft and flexible is by putting it into a bathtub filled with water and let it in there for several hours(e.g. overnight). Since the wood will swim in the bathtub, put some towels on top of the wood, so the wood will sink and be completely under water.