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What I see in the video is you cutting what appears to be something like 2x12 lumber. Nowhere in the bill of materials is anything like that specified, unless it's maybe what you called "(6) Southern yellow pine (lumber)". If so, it could be a little more specific.
Trying to find a bill of materials, I discovered that the project description doesn't include that and in fact, you can't find that out without either subscribing to all of the writer's projects or paying for a "pro" version of Instructables. Disappointing.
I love 100% whole wheat bread and make 2 loaves a week for myself, one loaf at a time, and use a process/recipe of my own that takes 3 hours, start to finish.
Raspberry Pi Class
What You'll Need & Learn
If you'd care to email me at email@example.com I'd be glad to do send you the .stl file that I used for my own 14.4 volt drill.