The simplest way to do shared storage is to make one computer a file server and share out the media.
This depends on the data rate as the cheapest way to share is through a GigE ethernet switch which means forget uncompressed.
I finished a job this year where we had a main MacPro connected to a XServeRAID that was used as a digitsing/edit station, a separate main edit MacPro and a playback Mac. We were also streaming EVS files onto the RAID via the MacPro. Quite a lot of traffic without a hiccup.
Granted, you guys have MacBookPro’s so no guarantee if it will work, but computers are getting so fast these days they can do a lot in the background.
Hope that helps
Peter