Upper Front Cabinet Removal-2008 Safari 20

[CCWilson1]

Can anyone offer advice on how to remove the cabinet over the bed in a 2008 Safari 20'? (see photo) I have removed every exposed screw above, below, and inside the cabinet, but no joy. The primary support for the cabinet appears to be behind the carpeted panel circled in the photo. I have spent a fair amount of time removing screws that are nearly inaccessible, using a tiny right angle screwdriver and sore forearms. I am quite certain the factory didn't assemble it this way, so there is some attachment point or method I am missing.

Thanks for any help you can offer,
C.C.