Here's another approach using the "Angle Cut Tool for Table Saw Sled" shown in the video
.
1. Start with the control panel top piece
2. Use a properly adjusted router table with fence and roundover bit to round the edge.
3. Use the adjustable angle table saw sled (yellow) shown in the video to cut off the red.
Position the piece horizontally so the edge of the cut is exactly the radius of the curve from the edge.
4. Flip the piece over, change the sled angle so the cut is horizontal, adjust the fence position/blade depth to cut a groove.
5.
Without adjusting the fence, cut a groove in the vertical board (blue) -- same distance from blade to fence for both groove cuts.
6. Cut a piece of wood (green) exactly the width of the groove and glue everything together.
Scott