<<<<

This concave on the underside of the board helps channel the water. There should also be a slight rocker 'banana shape' to the board with the nose and the tail being slightly higher than the middle underside of the board.

<<<<

This is the rail. The underside of the rail should be sharp to help cut through the water.

When making the handle think about comfort and safety. Try not to make it too tight or too loose.