Yes, I have that drawing.
Here's how I removed the front panel from the enclosure case.
1. Remove the front two feet.
2. Inside the case, remove the 3 screws found on top of the panel. (The center screw has a ground lug on it.)
3. Look for the three tabs holding the bottom of the panel. I lifted the one on the left first which enabled the panel to separate from the frame slightly. After that, I went to the center tab and repeated the process and then the last tab popped off and the panel was free excepting for the cables.
Thanks for your help