Thread: Cheap Cubby House ( Well Cubby Castle)

Hey,
My wife has told me to Throw out my old building timber or use it , as such i chose to use it so i started building the kids a cubby house . I am trying to save some $$$ here and was just going to use 12mm plyboard ( as its cheap) for the outside walls , the hole thing will be painted , my question is will it survive a few years in the weather?

My father in law says i need to use marine grade , but isn't that overkill for a building with a life span of 5-10 years max?

Please point me in the right direction here, on one side , i really dont want to spend the money, on the other side i want it to last for my kids at least