Please bear in mind that 'Water, for all intents and purposes, is an incompressible mass.' We teach this to student divers.
Look at the following points...
Fore-planes - they are curved and cannot act in an 'aerodynamic' manner (wings create lift by causing air to reduce in pressure as the air moves in a longer path over the wing than under it,) so they are really just flow directors, and the curves will create permanent turbulence and disrupt flow behind them - the forward vertical thrusters.
Forward vertical thrusters - turbulent flow will create beta on the blades (uneven flow vectors to different blades) destroying efficiency. The fenestration/cowl that surrounds the thrusters will cause turbulence also.
Forward hull - the hull immediately around the area of the forward thrusters is voluminous and bluff to the flow of water when under way. Turbulence and drag will ensue, and this will run toward the stern gear - thrusters, aft planes, pusher thrusters and elevator.
Stern vertical thrusters - similar flow conditions will exist for these units as they exist for the forward units.
Pusher thrusters - will receive all turbulence created by gear that is forward of their position, and reduce efficiency accordingly.
Elevator - single piece curved flow director, similar to the fore-planes in intended down-thrust effect. Same problems of turbulence and drag. Potential for anti-asynchronous oscillation from turbulence caused by all equipment forward of its position.
I saw the previous version of this craft, the Super Falcon, when it came for a demonstration in Jordan in April 2011, and was unimpressed with what I saw.
This concept version is not an improvement. They should get proper designers to work on it, not people that just happened to see an aircraft, or read a few pages of Wikipedia.