X2 !!! You don't want to lay the sod like that, you will regret it. I've seen yard's like that, they looked terrible. The analogy to railroad tie's is exactly right, and with slow growing zoysia it will take 3 year's to get that effect. If you want to save money, do the front yard and then wait on the back. Believe me on this. Think about sprig's first, at least it will be even.