Next was new windows and doors, well the mobile home was made with 1x2. Do you know how hard it is to re-frame for new windows with 1x2 -- what were they thinking?? A 2 x4 is not that much more$$... so that is what we did. We replaced all of the walls,yea we are crazy!! lol It was so much easier to do all the walls this way and since this will be a rental and we live 3 hours away!!! The MH ended up being a total new home. The outside is Smart Siding.