I'm just getting to MoI, and while it is pretty easy to pick up, a few things are escaping me. One of those things is how to create a flush panel - in other words, something like a gas cap cover on a newer model car, or the facing plate on the CD/DVD drive in your PC.

I guess the easiest way to explain what I'm trying to achieve would be this: I have created a box. In one side of the box, I want to put a panel. This panel must be flush with the surface of the box. The only evidence that there is a panel at all is the line around the panel. Now, I can't just draw a line around the perimeter of the panel, as that line needs to have some depth and thickness. Basically, I'm looking for a way to "scribe" a line with depth on a surface.

I know this might sound a little confusing, as I'm probably not explaining it too clearly. I've attached an image that I hope will get my point across. Thanks!