i just finished building my template hood to test it out. you can see the way it will function. the middle board with the square holes in it will actually have a piece of glass in it so i dont get any water splash up. I am also going to paint any part that may come in contact with water with some marine paint.

the stars are where i am thinking of putting fans. two on the back to push air across the water, and i will have two vents on the side for the air to escape. i am also going to put 2 fans on one side of the light pushing air, and 2 on the other side pulling air so i can get a nice flow throught the lighting to coll the MH's down. i dont need to worry about pulling humid air since the lights will sealed from the water. does this seem like nough fans. i am probably going to use fans somewhere in the 80cfm range.

So does anyone see any way i could improve the top other than putting it on hinges so i can open it (thats the next step).