We have several older manufactured homes being installed for use as worker living quarters for a construction project. They have kitchens and bedrooms but were plainly converted from office trailers. There is no HUD label. If these units meet all other requirements of the NEC for circuiting, GFCI protection, and any other requirements, is this a legal install or is a HU label required? They have kitchens and bathrooms and sleeping rooms in each manufactured home.