On our Monaco, I pulled out the old tv, remade the cabinet to the new 'flat screen' dimensions, installed an articulating mount, then added a new 32" flat screen. We love it. I guess it just depends on the type of cabinet your TV is installed in. As far as the upholstery you're talking about, one thing to keep in mind is you can always re-cover with a vinyl. I did that on the engine cover in our old gas motorhome. It was previously carpeted and I pulled that off, added a thin layer of padding, then used an off white vinyl to match the dash to cover it. It ended up looking like it was made that way.
Vern and Beth Borgman
2002 Monaco Diplomat