shelf for pc grow case

Hey everyone I'm new to all of this but have been reading for about a month and my pc case is almost fully constructed(will put up pics within next day or so).

As I'm adding some of the finishing touches and all I was wondering what people have used for their shelves in their cases when their plants are small to bring them closer to the light and for lsting. I want to do something similar to pcgrowcase.com's shelf but have no idea how to find it in a store or anything.

Any help or suggestions would be great. Thanks.

Noone has any ideas?

anything flat that will fit in the box around the same height. i use cd cases or old vhs or books or etc. sorry no one answered ya this long. lol