check out the people at dunlap wood crafts for pre-drilled handles at really good prices. fancy wood too. their e-mail is:
[email protected], real nice folks.
heavy walled seamless tube is a good (and cheeper!) substitue for gun barrel. the heavier wall thickness gives you more meat in the blade and more room for fancy file work around the bowl. be sure to forge weld in a steel cutting bit. old nicholson file works well and is cheap, as well as water quenchable. for a 'hawk blade draw the temper back to a light blue and it should be plenty tough.