What's latency going to be like? That's my only thought.
Do you mean about delay between read of ouput status and trigger events ??, I must check yet, but all these radio modules allow send data very fast, and data are only a few bytes for status of all outputs. So switches matrix is 2 bytes, lamp matrix are 2 bytes and direct outputs 1 byte data and 4 bits by each 8 outputs, so total only need 6 bytes to send status of ALL switches, lamps and direct ouputs. These 6 bytes repeat constantly to read in real time status of all. I think no problems with delays.
Also, with regard to the MK64/66 and DMD, whilst I guess they're not available now ... I'm guessing in a year or two it will be possible to get smaller LEDs of the type used in the DMD that are sufficiently reliable and long-life that higher resolution DMDs could be used. Have you thought about if or how it could work with for example a 384x64 LED DMD of the same size?
Currently there are already smaller leds for DMD, but very expensive, and though replace led panels with higher resolution, if original animations keep with original 128x32 resolution will not improve look. For topper I'm checking to do a higher resolution, so a 256*64, and play GIF animated files, but I must check yet what hardware use, microcontroller or Raspberry Pi.
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