UV Unwrap on Mac (noob needs help)

Hello

Hello, 

I am playing around with gamedraw in Unity(mac) for first few times. I am having trouble with UVs for my object. I must be doing something wrong…


I can unwrap and texture a regular cube just fine but when i try a slight more complex shape I get confused…I am including my prefab named runeslate.

I would like to get a texture that I can paint and expect it to keep proportion. Its hard to explain in a message. but I would expect my unwrap for the face of the slate to taller than it is wide. Like a portrait. but when I unwrap i get a perfect square for the face.. 

screenshots

prefab -

https://dl.dropboxusercontent.com/u/7743792/runeslate.unitypackage