I need to replace the HDD in a MacBook Pro (late-2011), and I want to replace it with an SDD. However, the user has a 750GB HDD and needs space. Hence I thought about getting her a Transcend StoreJet 500, take out the SSD and replace the HDD with it, put the HDD in the Thunderbolt caddy and use that as an external Thunderbolt storage. Is that possible? I know it will physically fit, but will I have any challengers doing this swap? Another option is to get the MacSales DIY kit, and replace the MacBook Pro CD/DVD with an Data Doubler Kit + 1TB OWC 6G SSD.