Both Ger21 and myself have been in contact with the manufacturer of the MB2 and he has agreed to create a version specifically for the UC300ETH so by the time you do your build the 5v power supply wont be needed and your install can be even more compact.
I wouldn't count on this any time soon, and if it does happen, I'm curious what the end result will be. CNC Room mentioned that it would be easiest to basically duplicate the MB2, but for the UC300ETH. My opinion was that if it didn't take full advantage of the UC300ETH, there was no point in doing it. If it doesn't utilize the Analog I/O and all 5 ports of the UC300, then imo the current MB2 would be a better choice, at least for me.


And I don't buy into the price comparison of Clearpaths to steppers. You'll never compare apples to apples, as the Clearpaths will always be far superior to steppers. But I can put together a high quality stepper system for 1/3 the price of those Clearpaths.
I'm using AC servos on my machine, at ±$400per axis + cables, which is comparable to Clearpaths. A 640oz stepper and good digital drive can be had for $125 per axis. And imo, the cost difference of the cables is minimal.