How fun! I've done major rot repairs before as well, but never such a total project. Here is something to keep in mind as you rebuild if you are not an engineer. Just remember, cabinets, closets, built in furniture and interior walls all add strength to your trailer. Take that all away and you have very little strength left. Things will wrack and move as you go down the road, old trailers like that were not built just to have four walls, a floor and ceiling. Thanks for sharing and let us know how the rebuild progresses. All the best, Hans