I haven't managed to install the last piece I got from Boot13, but once I get caught up on the interior work I am thinking of having him make me a panel that will at least allow for a couple of USB ports.
I haven't tried to play around with any layout yet, but ideally I would like to fit a 12v cigarette lighter port and two USBs. I suspect depth may be an issue for the cig lighter though. I might manage to fit in some Anderson PowerPoles instead.