Update for current Model X's: Got the cable from Panjo, and the LELink, and the beta software, and everything works excellently. The only issue is when I pull down the cubby, the retaining clips from the top 'ceiling' come with it. In current X's at least, it's trivial to pull out the whole cubby, there are no clips on the rear, just two tabs that go into slots, so it's easy to get it out and examine and work on the problem.
But, it took me some finagling (technical term!) to remove the clips from the top of the cubby (since they have really good barbs holding them in place), and then it was easy to pop them back into the top surface and snap the cubby's tabs back in. If they aren't meant to be removed from the cubby tabs, they sure don't seem to snap back into the 'ceiling' without being removed first....
Is there a better way to use perhaps other clips that are more prone to being reused and not come out with every 'removal'? I'd hate to do this every time I want to use the data cable!