Finally I completed the echo device.
I used ddo again.
I spent 10 hours for high model, 6 hours for low model, 8 hours for baking normal map and 10 hours for texturing.
I made the texture while researching and referring to tutorials and i spent too much time on it.
I could not get the reflection point to be well represented in the sharp texture.
Now that I've found out how to use ddo, I want to be able to go through each process a little faster.