Unfortunately, the interior of Airstreams are built from the back > forward. This means that in order to disassemble the bathroom with any hope of reassembly, the "parts" in front of the bathroom will have to be removed in order to get it out. When disassembled, it will fit out the door of your trailer in several large pieces without having to destroy it.
Once it's all out, the fiberglass/plastic parts can be cleaned/repaired and refinished to put back in. There is info on-board about various products used to refinish tubs/showers both professionally (resource: boatyard repair facility) or DIY. Do make sure everything is structurally fit before you put it all back together...you probably don't want to take it apart twice!
BTW, welcome to the Airstream family!
Shari
