Here's one...
jkm,
Your panel will be different in some respects, but here is a photo of ours.
Our panel is just like the ones in most of the late model Ericson's, with the breakers for AC in a row on the end, beside a double row of DC breakers.
Nowadays the standard is for a cover over the breakers and their connections to protect you in case the panel is open and the circuits still energized.
Our last insurance survey mandated this cover, and coincidentally I had been a bit nervous about working around this area for quite some time.
The simple answer is to unplug shorepower, but much of the time I need it for running tools and aux lighting while working around these same areas of the boat.
I made a card stock pattern and had a plastics shop (Tap) cut, drill, and bend it for me. It is secured with short ss screws. I could try to look up the price, but I remember it as being inexpensive.
Hope this helps you a bit.
Loren