It looks like the footprint for the Hathor 215 is going to be 18" wide by 13" deep, with a height around 38". I think the weight will come in just south of 50 pounds, but won't know for sure until the production version is sitting on the scale. You probably ought to think of the Hathor 215 as roughly the equivalent of a Kappalite-class 115 cab as far as maximum output goes. It will be a little bit more efficient than a single 3015 (non-LF), like maybe 1 dB more, but I'll be claiming a little bit less thermal power handling (400 watts vs 450) because a sealed cab doesn't benefit from cooling airflow like a ported cab does. We could see as many as three different versions of the Hathor 215: 4 ohms, 8 ohms, and a rear-ported low-tuned 4 ohm "215HO" version with two Kappalite 3015 (non-LF) woofers. The latter would of course be more expensive and unfortunately several pounds heavier, and would be lacking in "growly" relative to the standard version, but it would deliver a lot of sound per square inch of footprintage. Also, the top end of the HO version would be a bit subdued, because the single cone midrange wouldn't be as loud as a pair of 3015s in parallel.