import cadquery as cq
board_width = 100
board_length = 500
width = 40
depth = 30
startX = -board_width / 2.0
startY = board_length / 2.0
pts = [
(startX, startY),
(startX + width, startY),
(startX + (width - 10), startY - depth),
(startX + width * 2, startY - depth),
(startX + (width * 2) - 10, startY),
(startX + width * 3 - 10, startY),
(startX + width * 3 - 10, startY + 10),
(startX, startY + 10)
]
board = cq.Workplane("XY").rect(board_width, board_length).extrude(10)
board = board.faces(">Z").polyline(pts).close().cutThruAll()
show_object(board)