Why not cover up that large gaping hole that is no longer needed for the older cathode ray tube TV’s. Have the space framed out to hang a flat screen tv and also have the finishing company make you a custom mantel. You can still store a cable box behind the TV and have access to the recepticles. My last customer ran out an IR sensor for their cable remote! Estimates for a fireplace remodel are easy just email email@example.com include your name and address, phone number and a picture or your current fireplace space.