Hello, I am nearly at my completion of the project, which now has commercial interest
I have the ability to drive 340 RGB Leds (as 2 x 170) or 256 RGBW Leds (as 2 x 128), in NRZ or SPI data at 25fps
Also with a full configuration interface in a browser, with the ability to finely adjust RGB&W brightness for colour matching between panels/strips, as well as test the LEDs in the panels/strips.
This whole project was cost driven, as such I have a fully completed product for a build cost of a little over £6 (including all packaging)
For more information visit my DIY DMX Lighting Group : https://www.facebook.com/groups/584412254990472
I would be interested to see what you have found, similarily :)