Digging thru the development thread, its 8.5 inches wide, 18 inches tall, 14 inches deep. iirc, the slope of the OB cavity is 10 degrees, with roughly one inch past the back of the front baffle before it slopes up.
I'm currently trying to figure out the overall size of a potential floor standing version with dual woofers like those in the X-Statik, while still matching the 14" depth of the standard NX-Studio. I'm thinking something like 30"..? but that could put the tweeter higher than is desirable? Maybe a compromise of 15" deep could bring the height down closer to the 38" tweeter height, since the mid woofer cavity can also be a little more shallow?