Of course not! In fact, there's a board devoted to specifically map requests. [link] (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&board=58.0) I may be able to make your heightmap if you PM me what you need. I should have it done later or so. Anything that's against FH rules will be placed here: [link] (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&board=38.0)
edit (since it wasn't asked at my time of reply): Define three terrains. ;o Do you mean the heightmap as well as the mask?
I believe you only really need one, however you can have two if you use this tutorial: [link] (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=13363.0)