Any one have some tips for the placement of Quad Fins?

I've got a thruster shape that I'm working on and I've finished the glassing (eps foams with 2 layers of 200g @ 0°/90° & ±45° of carbon top and bottom no stringer), I'm thinking of putting a Quad Fin set up on it because I'm going to use it for kiting. Or should I just throw the thruster set up in it and make a new one for a Quad?

Really should put a pic of the board up but I don't have one, tomorrow.

Cheers
CC