Set the series, finish and length. The drawing updates to the real size and the cut list prices it from the board we'd actually consume. Nothing is cut until we confirm it with you.
Your length is cut from a single solid paulownia blank in the next stock size up. The stock plan above shows which board, and what is left over.
A fresh cut exposes raw wood. We re-sand and re-stain that end to match the rest of the board, so the shelf reads as one piece from every angle.
Past 60″ a third bracket is added, rated to 100 lb into studs. The drawing adds it the moment you cross the threshold.