I am actually in the process of trying to do it right now, what are the exact sizes of the various inventory panels though? Like for instance the map box, the 4 little map buttons to the side of it, etc... I need the sizes of them so it can be precise when I make the box around it. Someone at some point in creating their own custom interface must have made a template...I made a rudimentary one which even I would be willing to upload here as a guide, but I want to make the sizes of each of the panels perfect to make it as polished as possible.