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

[The Grizz]

So I finally got a chance today to start building the heat sinks for this tank. I have decided to do 2 - 39" x 12" heat sinks both will have 136 LEDs but will have room for more.

Got my main plates of 1/4" aluminum cut & 48 pieces of 1/8" x 1" aluminum flatbars as well.





First 5 flatbar fins tacked on:



Now 10:



15:



20:



And finally the last 3:





As you can see in the 2nd last pic I removed the very first flatbar fin, yes this was planned because I am going to wrap the whole out side of the 1/4" plate with some 1/4" x 2 1/2" flatbars.