Buildings disappearing on my custom map.

[woodyatt]

Fellow Survivors and Modders,

I am very new to modding/map creation but I decided I wanted to make a custom section of the map for my friends and I to build our base. I have worked through the steps to generate the map in game and have made a test house in BuilderEd which I placed into my map using WorldEd, but when I go into the new version of the map in game it seems as if the house is not a part of the physical world and disappears when I get too close. Not sure what I'm missing here so any help would be appreciated.

Thanks