Why the HT1632 with RGB?
How are you going to PWM the channels to get the various colors?
Why not just build it out with TLC5940s and matrix them.
I'm asking because I don't know and was thinking of building a RGB matrix with TLC 5940s so that I could get 30bit color. With the HT1632s, it seems like you're going to have to go to a lot of effort to get any level of blended colors. ????