My chosen location for the outlet has a body contour behind the panel (first picture, where the duct-tape is. To install the box, I need to cut out a chunk. (This makes the volume of the box smaller, which might make it a little harder to wire. If you are a stickler for following housing building code in your van modification, you would have to measure the remaining volume to make sure it it still big enough.) The Dremel saw and liberal use of JB-Weld took care of the required modification. I used an "old-work" box because it has installation tabs that snug up against the panel and keep the box secure.