Laura and Sean have a huge family room with two columns that keep them from fully using the space. Anitra encases the columns inside a chic wall of wood and metal to give the space a split personality. On one side, a family-friendly hangout with oversized furniture and a huge TV, a custom-built bar, and updated built-ins at the fireplace. On the backside of the wall, the couple's two young children get built-in desks for arts and crafts. A kid-friendly slide gives them quick and fun access to the room, while ingenious storage cubbies are hidden under the stairs to contain the clutter when company comes over. But the O'Briens get busy with helping build their own Mega Den, too: Dad goes psycho with the demolition, Mom fires up her creative spark with a welding lesson, and the little ones get into the swing of things with a high-flying art project that may leave a lasting mark on more than just the canvas over the mantel.