Is that an official list? I am asking because I checked again on the History Channel website and didn't see any distinction between "large" and "regular" knives. As far as I understand, those participants that decided to take a knife (9 out of 10) were allowed to pick pretty much any kind of design regardless of size. Most seemed to prefer somewhat smaller belt knives but Alan had a kukri and Lucas used a custom knife with a large, hefty blade.

As far as making your own hunting bow and arrows... It can be done but it is a pretty demanding process. It also requires proper bow wood, hopefully seasoned. Fishing line is not ideal for a bow string. And making arrows that fly true and hit hard is another challenge. Frankly, I don't think it's a realistic proposition for most people.