Sorry to be the bearer of bad news, but if the water has already caused interior damage to the walls and floors, paying someone to do the renovation work (unless it's a friend who doesn't require much in the way of income) would most probably exceed the value of the trailer. I'm speaking from experience (check the pics of my 1992 Solaris rebuild on my photobucket site in my signature). The only difference between you and me is that I did the work myself. Of course, I saved the labor cost outlay, but the lost time was priceless!
If the floor is not rotted to the point of being a hazard to walk on, you might just want to use it as it is. The mildew odor could be a problem, and if bad enough, you would then be dealing with a health issue. The big problem with rot from leaks is that it will most probably have affected areas that are buried within walls and flooring. To get to those areas means tearing out the interior walls, flooring and of course everything attached to them. Sunline cabinets etc, were screwed in from the outside before adding the siding, so to remove them means prying them away resulting in broken wall paneling. Removing the siding only will do nothing for changing interior paneling.
Either go as minimal as possible, or bite the bullet and have all the work that is needed done, but don't consider the cost as a factor. To pay an experienced carpenter to do it right, you would have to be left in a hole money-wise.
1992 T-2470 (now residing in South Carolina)
Current Sunline-2007 Solaris 2499
2018 Silverado 1500 w/Max Trailering pkg.