The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
I'm a big fan of balsa wood mock ups. You can buy balsa in different thicknesses just like handle material. Stick it onto your wood blade template or even a steel blade using double sided tape. It's super easy/fast to shape so you can try different thicknesses and contouring. It also gives you experience in how exactly you go about shaping a handle.
Handle thickness just depends on the size of the knife, what the knife is designed for, and the end user. It also depends on the amount of contouring you put into it. If it's fully contoured then you need to start off with thicker stock (3/8" or so); if all you're going to do is round off the corners then thick stock won't be comfortable so you might want to start with 1/4" stock. Something to keep in mind is thicker handles limit wrist movement. If you're building a machete it's temping to make the handle bigger to match but that ends up creating a slower feeling, less maneuverable tool.
Paint sticks are also a free option. Paint stick knife below. One small and two large sticks.
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