Mate you can turn that into anything you like! It won't fit a full single DIN unit however as the side parts intrude on that space further back. If you're willing to do a bit of work with a Dremel and depending on how professional you want it to look there's lots of options. cya bye did a fantastic mod with putting a Scangauge there as seen in this thread. While I did a much less professional looking, but still decent I think, mod of putting a smaller than single DIN CB radio unit in there as seen in the below photo.
Whatever ideas you come up with, be sure to share them here mate!