You can get the area of the face of the plywood piece from Entity Info and then multiply that by the square foot weight. You could do the same for price if you want. There is a cut list plugin that would tell you the number of square feet of material if the component name includes a sheet material word such as Plywood, ply etc. It calculates the dimensions by the dimensions of the bounding box of the component so the irregular edge you'd get from your example wouldn't be figured into the square foot calculation. The cut list plugin will also calculate board foot numbers for timbers.