Hi Doug, in my signature line there's a link, and there you'll find pricing information.
Dimensions for the 1203 are 18" tall x 14" wide x 13.5" deep. The actual depth of the cabinet itself is 13", and then there's some grille pooch-outage. I may have written in some places that the depth is 14", but 13.5" is probably a more accurate claim (it's 1/2" shallower than the Thunderchild 112). Weight is 25 pounds. If we omit the midrange smoother switch, the weight goes down by 1.6 pounds, and the price drops a little too.
Driver info... the woofer is the stock 8-ohm Kappalite 3012LF, first used by greenboy in the fEARful 12/6, and the midrange is the Faital 3FE22. On paper the midrange comes up short as far as efficiency, but we gain back some energy by harvesting the backwave with that open-format mid-chamber. Power handling also looks like a mis-match, but I think it's okay for bass guitar (though not for PA), as I protect the driver well with the crossover, and then once again the open-format mid-chamber comes into play, facilitating cooling, particularly in comparison with a sealed midrange chamber.
The cabinet's net internal volume is about 1.2 cubic feet, and it's tuned to about 45 Hz. If you model this, you'll see that the cab is theoretically minus 3.3 dB at the 62 Hz first overtone of low-B. I think this is "adequate"... it's not a killer low-B cab, but arguably not bad considering size and weight. I have experimented with raising the tuning frequency, something easier said than done with the modular flared ports, and so far haven't been much impressed by the theoretical .5 dB gain at 62 Hz.
If you'd be looking for a bit more output, there is a Hathor 1533 in the pipeline, which will replace the original Hathor cab, the 1544, in a somewhat more compact format. The plan is for the 1533 to be available in low-E and low-F# capable 4-ohm versions, the latter of course being more than adequate for low-B. The low-E version will "handle" low-B from a fartout standpoint, but would probably need a bit of EQ to really "deliver" it.