Leather is a great material for first-time didgeridoo builders, because it's relatively easy to obtain, not too expensive (especially if you keep an eye out for sales) and doesn't require any expensive tools or prior knowledge.
You should expect to spend around 10-12 hours on this project, although it can be done in 6-8 hours after you have already made a couple.
The initial cost for all of the materials and tools is around $200 and you'll have enough materials to make at least 2 didgeridoos, maybe 3. The cost per didgeridoo, excluding tools and re-usable materials, is around $50 - $75.
I got started crafting didgeridoos out of leather because I don't have the know-how, tools or space needed to make "split and hollow" didges out of dried logs, and I don't live somewhere with a ready supply of yucca or agave stalks. After some brain-storming and searching, I found a guy that makes leather didgeridoos ( Marko Johnson ) which inspired me to try my hand at it.
I've made a variety of styles of leather didgeridoos. Hand stiched, "triangle", "triangle spiral", sectional, and the simple "wrap and epoxy" style which I will describe in this instructable. I've added some pictures of some of the other styles of leather didges that I've made, if you're interested.
After a while of building leather didgeridoos, I got interested in the physics of didgeridoos, especially in the area of how the bore shape affects the playability and sound of the didge. I did some reading in some acoustic journals, and eventually made a program to calculate what is called the "acoustic impedance" of a didgeridoo with an arbitrary circular bore shape. I've recently created a user-friendly interface and released the code as open source. You can get it here.
One of the great things about this method of making didgeridoos is that it is relatively easy to construct the didgeridoo so that it has specific bore dimensions. This appeals to me because it allows me to design a didgeridoo before hand, using my DidjImp program, and then build the didge and see how it sounds. This allows me to experiment with different designs and learn more about how to make a didgeridoo with specific playing characteristics.
I hope you find this instructable useful. If you do make a leather didge using these instructions, I would love to hear about it! And I would love to hear any feedback you have.
Note: Some of the images are hard to see at the small size shown on the page. I've uploaded full size images, so you can click on the "i" buttton at the top left of the image and choose to view the original image which will be a lot larger.