You might also consider the Traxxas 14v Marine Titan motor. Good efficiency for the amount of thrust. As for the ESC, research all the various brands, Electronize, Traxxas, Novak, and Jomar. I have never tried the JETI controllers, but the Vipers seem to work quite well. As for Vantec, they have the most accurate amperage ratings. Not inflated to sell units. When they advertise "continuous" amps, they mean it. For some makers, "continuous" really means a short 2 to 3 minute contest between cars or trucks. Be sure to properly fuse your motors to protect your investment in the ESC. As for the three motor, two ESC arrangement, that is not a bad solution. It might be tough to find an ESC that could feed all three hungry motors. It also offers bit of redundancy for reliability. As for gel cells, only if you want ballast. Run times - 30 minutes is a bit of a stretch. Depends on how much throttle you want to use. Being a PT boat, you'll want to see it you on plane most of the time. I think Tachikaze has the right call.