Use NAS/ Gigabit Enet drive for video?

[Joey Cupcakes]

Helping someone set up a high-capacity, fast, reliable expandable video editing system where there will occasionally be more than one user accessing. I'm thinking RAID-5 (with 4 3 or 4 TB drives) using NAS on Gigabit Ethernet. That will get us 9-12 GB right off the bat with redundancy and we can add more of the same later. It also makes use of his currently available technology, i.e. a Mac Pro 4,1 w/ 32GB RAM running Mavericks with no card slots available.

Should this type of system perform well for video editing using Final Cut X?

Any other suggestions?

Thanks,\.