I think I've seen the carpeted ones before... they are literally just covered in carpet as opposed to only metal. If you're going to be traveling with it a lot, it'd be useful, but I don't think it will increase it's life or usability, just help to maintain it's cosmetics.. and at that point it's wrapped in carpet, so how's that for cosmetics.
Da-lite's are a delight... I stil have my dad's lenticular from the 70's and it's a solid sender. If you ever want to try 3D projection, you'll need a lenticular. Cheers