I had a 10x10 putting green with a cutout for my CCE hitting mat at my old home. I'm making this setup a little more modular, and may have enough room for 12x12. Considering that my cutout is offset to the right, I was considering adding 2' of something along the wall I face. Maybe a strip of rough material (my hitting area includes 4 holes in the corners)? Maybe a ball return system? I'm open to some ideas. Obviously I'll also have some space either at the front or back of my original mat (or both, depending on how I position it).