Give the spline modeler a try. Do just as Mark said in his first post. Create the shapes - maybe working from the "front" view. Create the back board, then draw a circle, shapes, bars, etc. over the back shape. Then select all and combine under the arrange function. It will take the "inside" shapes out of the outside shape. Play with it. It is much easier than using a boolean to create the negative shape.

Never Give Up!