I am wanting to raise my sunken living room. It is sunk 6". Thinking of using 2*4's and 1 layer of particle board with good quality plywood on top. New wood or lamiinate floor will be on top of that. Wondering if this will bring the floor up to the level of the other floors and if this will work. Though of ripping 2*6's 3/4 inch and laying 1 layer of plywood. Which would be best???