I did a tute on a fabric covered workbox. It isn't exactly what you are looking for, but you could look at the general method, and make your own. The rule of thumb is that whatever sixe your card for the outside piece, make the lining card 1/4in smaller. Cover each of them individually, usually with some batting behind your fabric, then glue lining to outside, then sew up the box. Hope that helps.
http://www.quiltingboard.com/t-28902-1.htm