Yours didn't come with wifi? I must not of paid much attention, I was thinking WAN card, probably being you added on the slot. Shoot then, just route the wires to opposite hinges, run em up the back of the lid and the plates, film whatever, should sandwich in between something to get fixed in place, or you could use a dab of hot glue, double sided tape, etc. Just make sure they don't interfere with anything, it could cause the bezel to not sit flush.
I think there are even guides to route the wires in the lid.
This is going from installing a touchscreen in my 9 a few months back so details are a little fuzzy but that's the gist of it.