I have been getting this question a lot via email. Everyone wants to know where I got the little shelf that helps organize the spices as seen is THIS post.
My husband built it specifically for this cupboard. We had some scrap particle board that he cut down to the sizes he want. It is just 3 long boards glued and nailed to 2 smaller side boards. Nothing difficult, but is exactly what we needed. He actually had to assemble it inside the cupboard because it would not have fit in otherwise. So, there you go.