carpeted

Any body know if there is a base carpeted cargo mat? All I can find is the three row or the two row ultra lux mats .

So, on the 'tailgate', what is under the carpeted area, where there are 4 fasteners? Is it storage, or access for something else? Also, with the third row seats up, does anyone know the width of the space in the back? Would it be able to carry sheets of 4 x 8 plywood or sheetrock? Forgive my...