Welcome to the forums, newcomer!
I would advise against repurposing a NAS pedigree drive into an external enclosure for portability's sake. How old is the HDD in the NAS enclosure? If you don't have a problem with the data on the drive being wiped in case of the HDD failing over time when in an external enclosure, then you can drop the HDD into any SATA based external enclosure which are made by Orico and their ilk. If the data on the drive is mission critical, you should divert your resources to a brand new external HDD.