Late, but I have been messing around with Norfair lately and QD.
What I found:
QD is actually quite usable as a recovery move on this stage. If you miss the top platform just by a tad, you WILL get the second platform.
The auto-snap range on this stage is insane. I've snapped onto the second platform from half a character length down. O_o
It's impossible to QD from the Top platform to the bottom platform. Either you hit the second platform, or you die.
If you attempt the drop down, second jump, QD back to the ledge trick on Norfair, you will fly through the platform you are attempting to QD back onto, and land on the one below. This also, oddly enough, makes QD usable as an attack in this form, provided they were on the same platform you were attempting to QD hop onto. The opponent can't punish you, as you're too busy falling back down to the other platform.
If you Ledgehog -> DJ -> QD, on the top platform, you can land on the far end of the second platform on the other side of the stage.
If you ledgejump from either of the bottom or middle platform, you jump high enough to land on the platform above you.
Fun stuff eh?