Thanks Specktech - Yeah, some folks could build that using just a rough hand sketch - not me :) There were some critical dimensions for framing and venting that needed to be met in order to pass inspection, never mind that when the fireplace was delivered it needed to slide in perfectly with room to attach gas & electrical. It really helped to be able to rotate the 3D model and see it from all sides. When cutting a 10" vent hole through your wall, you really want to be sure it's in the right spot :)

Ed Ferguson