I recommend against setup scripts for window managers, because it makes it difficult to change components without understanding the consequences. In my opinion it's better to copy each config file manually, which makes it easier to later suit it to your needs.

It's more work to get a good starting configuration, but it pays off over the years of using it. Nothing prevents you from copy parts of someone elses config to quickly get started.

Edit: LARBS been around for a many years so it's a good choice, since it's likely to be maintained for years to come.