Assuming the BlueRay drive is in the standard 5.25 inch form factor, and has a sata interface, just purchase an external enclosure that has a sata internal interface, and a firewire external interface. There are lots of those available at NewEgg.com. I'd suggest looking over the user comments there before deciding on a particular model, though, as some of them have considerable negative commentary.
Regards,
-- Al
Regards,
-- Al