Here's my updated layout. I found an 8.46" heatsink at heatsinkusa with the t-slots like the makersink, but I got it square.
(8x) Cree 3-UPS (RB,RB,NW)
(4x) Ocean Coral White (Red,Blue,Cyan)
(8x) Hyper Violet
(4x) True Violet
(4x) Cool Blue
Should this do the job?