This is my first message on insanelymac, and first of all i would like to send huge props to all of you guys who put so much effort on sharing your knowledge here. Great job.
I am currently starting my mac pro hackintosh mod, based on a gigabyte ex58-ud5 mobo and a mac pro case that i bought from scrumpymacs UK ebay shop. The motherboard is probably not the best choice for the mac pro case, as it is a full atx motherboard and for sure i'll have to make some cutting in the top shelf, but i will go for it no matter what it takes.
I just removed all the original wires and started to research how i could remove the top shelf, and ran into my first problem. The top shelf is made of two pieces along with the opening system, and i just don't know how to remove the metal plates without making any damage to the plastic tabs. I removed every screw i found (lots of them, it's amazing how well is this case done) and found myself in this dead end.
I'll put a pic from macbookJoe's hack pro to illustrate this shelf i can't remove:

Could someone please give me some input on how could i remove this shelf without doing any damage?
Thanks in advance, you guys rock!