I don’t have any resources on vessels with 4 vectored thrusters, nobody really uses it. The most common maneuvering setup for tight spaces with speed is two thrusters that area able to rotate. Spally had some on his boat here: Hull Design Ideas - #5 by jspall
And I looked all through the RoboBoat documents and they all seem to use either skit steer or straight shafts with rudders: http://www.robonation.org/competition/roboboat