http://www.ebay.com/itm/The-LsDj-Turnta … 2591e3ed12
Don't let the sticker shock from the listing scare you, take a look at some of the crazy stuff here. The wiring is insane. It looks like somehow the DJ Hero Turntable is used as a giant potentiometer for a variable clock mod, while the Gameboy-built-into-housing looks like it is a "master" unit of some sort. The serial port on the CGB and parallel port on the DMG probably carried clock + link cable connections so that they could easily be sync'd to the turntable controller and thus have their clock changes be synchronized in a 1:2 ratio (DMG:CGB). This means that the user could easily and accurately beatmatch without using LSDJ's build in "Tap A on tempo" function, or having to rely on a standard link cable. May be handy to make the units functional in an actual DJ setup. The aesthetics lend themselves well to DJ controllerism and vinyl in a DJing context.
Despite the price being insane, it looks like this mod is a bit old in age since the DMG features a 2-LED (nonfinite?) backlight and the deck-embedded DMG has a 3-LED light, so this doesn't look like it's a freshly-flipped deal. What's also really striking is the crossfader in the embedded unit, I suspect it is connected to a passive mixer for mixing between two sources. The screen is from a Gameboy Pocket, and given the age of this mod, it might have been one of the first times a Pocket screen transplant was ever done.
Let me know what you think, it's a pretty unusual mod with great intentions 
ALSO I have messaged the seller, asking him to make the Youtube video non-private, as it is currently private but included in the description as if it were a public link. Hopefully we'll see this thing be properly unveiled and explained, it deserves it!