G'day

Today I tried to install a new head unit in my GQ. I didn't get too far...

It already had an aftermarked CD-radio and I thought I just need to push those "pins" in to take it out of it's DIN slot. That didn't work and I found out that it's actually attached with screws to what looks like a 2-DIN-slot unit (the lower one is a little storage area). I need to remove both to make space for a new head unit and a CB radio.

I've tried to get the plastic cover off but wasn't successful. I only see 2 screws on each side. It still seems to be attached at the top though. I didn't just want to apply force... I'm sure I'm not the first one to try and get this cover off. Any help would be appreciated!

Cheers