Building an addressable LED strand with WS2801 (custom pcb)

Great, so I want to use 6 leds in total per board. I would like 3 leds per channel, so two channels.. just to note that I will never, or very rarely use the 2 channels simultaneously, just flick between the two, but I would like to be able to dim each channel individually.
the Star of David configuration is perfect, that's exactly what I'm after!

The LEDs are as follows: Avago - ASMT-QWBG-NFHDE 150mA, 3.4v (typical) 3.6 (Max)
I ordered a few of these and they seem perfect.

In total I would like to have 90 complete modules daisy-chained together and be able to turn on/off or dim either of the two channels on each module individually, I was going to run them from a 12v power supply.
Again, Thanks

Jules