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Nice work! One thought on the birch ply - did you consider some type of plastic instead? I made some several years ago for a Ryobi BT3000 table saw from a cheap (Dollar Store) plastic cutting board. It flexes well, is very resistant to having the featherboard "fingers" break off, but it was a bit of a mess to cut. If you try, go slow with your cuts and expect that you might have some melted plastic bits on the blade and below the table.