Cube style terrain

Hey everyone… I have a question as a noob here with unity… And before someone says “yet another minecraft clone” … I’m not looking for digging or building terrains… What I would like to know is how to go about developing a cube shaped terrain with different heights but Not layers deep for digging as minecraft has (maybe 2 for some destructive effect on the top layer) I would love to use the built in terrain editor but it doesn’t seem like I can make squared off edges… I tried doing this with procedural cube instantiation following other minecraft tutorials but I couldn’t get anywhe near the terrain size I wanted… It had 10 layers in height which I brought down to one as I only really need one cube for the player to stand on… But that still locked up unity when i tried a 1000x1000x1 cube terrain…I don’t know enough about 3d programming but I keep seeing things about marching cubes and voxels but most of them are more than what I need such as 128 layer deep terrains or ability to add/remove blocks… The closest I could compare what i want to would be “Cube World” (videos on youtube) which I believe is voxel based and I know almost nothing on voxels or any really good sources to learn about them… Thanks for any help and yes I know this is like teaching physics to a caveman but again, any help or leads would be awesome…One last thought added after initial post… Would it be best to just create a mesh in a modeling program and use that instead of trying to generate a cube shaped terrain from within unity? Like I said above I don’t need to have depth so it could work that way I guess but not sure of how to set up multiple meshes as terrains that would be seamless…

Check this out:
http://forum.unity3d.com/threads/69573-MinePackage-Minecraft-starter-package?highlight=Procedural