Replacing Main Board

I have received a new main board. I opened up the rectangle under where the print bed normally rests. This is insufficient as theres a screw deeper in there that cannot be reached with a screwdriver that fastens the main board down. Is there a way to remove the entire black plastic layer that surrounds this? It seems like it should come off but its giving me some resistance and I don't want to break it.

 

@Geof Thanks! I have just found an easier way for future reference. There are two ways:

1.) You can reach the screw by opening up the right vertical compartment

2. (easiest) These screws are actually screwed in the bottom as well in the following sense:

screw|mainboard|rod|screw (accessible from bottom)

That is the rods that these two screws are screwed into is itself screwed into the bottom, so if you unscrew the two screws from the bottom you can just lift out the mainboard with the screws still attached.

EDIT- To clarify for #2, I would unscrew the 2 most accessible screws and then the other two screws I would just unscrew the rods. This way when putting the new board in you can screw the 2 screws back in so the board is secure when you flip to the bottom to screw in the other 2 rods.