You're probably close but it's a little less than that.  Remember there's really only the hashboards and control board - none of the brackets on the ends go in, there's half the fans total, and there's no outer metal shell anymore.  Each hashboard case fits 6 Ants.  The case itself is extremely light, at least this prototype one, because it's only .30 thickness.  If these make it to production it'll be double that so there'll be some structural rigidity, and then I'd agree the case would be 10-15 on its own.

Seat of the pants feel from actually carrying it around and getting it situated in the rack, I'd say it's probably about 45 lbs for the hashboard case fully populated, and about 20-25 lbs for the PSU case.  If I get a chance to weigh it on a scale when I move it to another rack in a week or so I will.