If you look in the full BOM, the first tab gives all the parts if you want to build from scratch ("Ordering BOM"), and the second tab gives all the parts if you're building from an OpenAg provided kit ("Kit BOM") which I believe is not yet available. The instructions assume you have the kit.
So, I believe you have two options: you can wait for the kit, or build from scratch. If you build from scratch, you're going to use the aluminum frame tubes (STR-RAW-0001) to mill STR-BAR-0001 through STR-BAR-0010 using the drawings provided. All the pieces that need to be actually fabricated from raw are listed in the last tab of the BOM ("Raw Materials") along with the raw piece ID, the fabricated piece ID, and the suggested tools.