Grizz's 300 gal 8'er / LED Heat sink build / Opinions on LED lay out needed

[The Grizz]

So I have finally made up my mind as to what I am going to do for LED's. With the help of Martin ( Modular LED ) we have come up with this:

4 - 12" x 12" LED pods all with 68 LED's each

20 - Cool White XP-E / 45 degree optics
16 - Royal Blue XP-E / 60 degree optics
16 - Blue XP-E / 60 degree optics
4 - Red XP-E / 60 degree optics?
4 - Green XP-E 60 degree optics?
8 - Natural White XP-G (high noon kit) / 45 degree optics

All the CW, RB & B will be run off 1 - 200w driver each, the red's and green's will be run off a 38w driver each & the NW will be run with 1 - 75w driver.

Also adding 2 EVG-AP-2F Dimmable Ballast Driver card's to enable all the LED's to be controlled by my Profilux 2EX controller.

Going to build my own heatsinks out of some 1/4" plate aluminum & 1/8" x 1" aluminum flatbar.