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If I remember correctly you build it from the top down using the decorator tool to raise the pieces up as you go and then lowering them down to fit it all together.
in a 2X2 area, place the green tip on the top most square, then place the others as shown, raise them all up as high as they go. Then place the container down. Use tool to lower the tear of seas, (the others will lower as it does), until it looks like in the picture...I don't have mine up right now, but the one in the pic, the green tip is a lil low, it should be up a lil higher