Ed, just a couple of thoughts. First, since I don't know what sort of changes you are planning, you may be more in the realm of an update rather than a major modification. I'd consider something like changing a backsplash, reupholstering, etc. as an update. Changing from a sofa to a couple of recliners is kind of between. Taking out the sofa and dinette and replacing with a bench that covers the street side, front, and a bit of the curb side with a removable table in the middle would be a major modification. Changing from a front living room to a front kitchen would be a MAJOR modification.
Second, pay attention to weight and balance changes. I've been told that the front kitchen models are quite a bit heavier on the tongue than those that have a front living room.
Third, don't expect to recover any of your costs when you sell. A tasteful, quality update will speed up the sale of your trailer, but it won't add much, if anything, to the price you get. A few years ago we looked at an Airstream that had been "updated" by painting all of the wood white. The work wasn't done well, and looked pretty bad. We passed on the spot.
David Lininger, kb0zke
Heartland mpg 181 (sold)
1993 Foretravel U300 (for sale)