Contrary to popular beleif, wood in boats or wooden boats will last forever. "IF" you take care of them. I fyou are going to keep it out in the weather, uncovered it will rot after a season or two. If you keep it under a shelter, it'll be fine. They make a ply that is used for signs. It has almost a paper backing, but it is designed to use as stated, a sign. It last a very long time outside. We put some on the top of a dog box for my cousins truck and wrapped in carpet. It has been there for five years with no sign of deteriation.
This only my opinion, but nothing you can say will change my mind. That makes it a FACT.
Today is a Blessed Day and a Prosperous Day