Jet powered model boat (inspired in NQD)

I have seen a lot videos of people who bougth an NQD to upgrade the powerplant and have a nice and funny model boat, i wanted also but i couldnt find the model i was looking for, and when i found it, it was too expensive. So i decided to design my very own jetboat. As you can se in my other project (http://www.thingiverse.com/thing:1141731) i have already a propeller-powered boat, it is nice and quick, and its funny to follow ducks ;D but it is not very agile, so a jetdrive was the new thing to