Need Help with Constructing Model of Grand Staircase Area

Sep 27, 2015
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I am doing a film for school on Titanic and was going to build a model of the Grand Staircase along with some first class halls and rooms attached to it. I was going to build it out of wood, but I didn't want it to rot when I flood it. If anyone has suggestions of easy to work with materials that won't damage too much from the water or something I can apply to keep the model from rotting and falling apart, please let me know. Thank you!