Originally Posted by Advdave
I did experiment with a rear door, but the side door provides way better access and I thought that was more important than access without removing the pannier. There is a guy building a nice looking box with a rear door, so if you like that option, it's available from Europe.
I think the side door is the way to go. I have one of the "boxes from Europe" and the rear door ends up being very awkward to get anything in and out of the box. My tool roll is too thick to fit without removing tools, and my hand doesn't fit easily into the box to dig things out.
For what it's worth, I'd rather take the side case off and have better access (and better security, likely).