Hackers Help: How to make a flip top for IKEA Brimnes Headboard?

ikea-brimnes-headboard-with-storage-compartment

Does anyone have a solution for making the entire top of the IKEA Brimnes headboard either removable or hinged so that it could flip up?  I would like to add a little board in the back and the bottom of those two empty spaces to create some blanket storage.

ikea-brimnes-headboard-with-storage-headboard-white__0351324_PE540629_S4

All of that dead space in the back of that headboard must be useable somehow!

Thanks!