Not Sure it will work but hey give it a go and Get us a Vid !!

I Did a Similiar Idea with an NQD Atlantio.. I Kept it Vector Thrust but made it Duel ESC'D and Two Type 540 Silver cans for a Bit more oomph.. as You will see in this Vid.. it was too Heavy and the But was way low in the water line..
took skill to drive as You had to get used to Steering and Squeezing the Throttle trigger(Pistol grip) then releasing one to make it Turn... you will hear one of the motors going in full reverse lol as I accidently engage reverse a few times lol.. So Yeah one Motor could go forward and one could go back..

Was fun but too slow and too heavy
http://media.putfile.com/Altantio-rebuild

So It Had Two No limit Car ESC's
Two 1800mah Nicad's
Two 540 Silvercans..
If I could have made it lighter it would have been good