i like your idea,but i would make sure that the drives are mounted parallel with the waterline as to not cause the boat to roll over by the thrust angle.this is a very good design by all means but i think you know what i am talking about.good luck with your new drive setups,also some streamlining is another thing to think about,a nosecone would make these more efficient.
tony p.
Gas Propulsion Systems.

Look for our new ready to race gas boats in the near future.guarantying 55mph out of the box performance,no assembly required