It’s a long time development for the new cube, we finally have some satisfying result now. Here is the final prototype, almost the same as releasing version. You will see we changed to 8mm foggy RGB LED instead of SMD ones,  increased the dimension beyond Rainbowduino. Most of the assembly difficulties are bypassed by the slim PCBs,

You will be able to get kits from depot soon, with or without Rainbowduino. : )