I was looking through a couple threads where you had pictures of your bathroom but now they are gone.
Can you repost them? I was really wanting to see your vanity and drawers notched for plumbing.
This shows it better. (Without providing the world with a photo of all my personal stuff, as I did in an earlier post.) You can see that the cuts need to be tailored to the configuration of the plumbing and the supply lines, which will vary from sink to sink.
Here is a link that might be useful: Thread that shows sink drawers in detail