If you've studied your reference pictures enough, the WoF templates are fairly easy to follow. The only issue that I had was where the top deck was supposed to attach to the back of the pack. It took me three tries to finally get the proper position, so feel free to learn from my mistake.
As for the frame peices, mine were 1/8" thick, as that was the thickness of the material that I was using. Hope this helps you, and feel free to quiz me if you have any additional questions.