Quote Richie Royale:
I've seen HD mounting kits which come with a DVD enclosure for the removed drive. Having looked at the procedure on the net though, I decided against it for the moment!
I've recently done it. I was rather brave and started the whole process without even working out how to do it, just following the youtube video, but with a bit of patience it came together perfectly. Now I have a 256 SSD and 1TG Hard drive in here (17" MBP). Even though I got a 5400rpm model it still destroys the perfect silence which I suppose is inevitable, but overall well worth the upgrade.