You could try SU4U to components. It will map a component to a selection of faces. So if you make that texture a single face component you could map it to theose plots.
With a radial gradient texture from photoshop (or similar) you can bring that into SU and fill a single square with it. Make that a component. Then select all of your rectangles on the drawing and that component and run the tool (it has various options) and it will map that component ( which has the gradient fill ) to those shapes. You may have to tweak the odd one, but it seems to work.
