I have a 48" x 24" x 24" galvanized metal cattle trough, so would that be more suitable housing for the time being?

Is there a reliable way to determine their gender at their current size? I would prefer that they get along if they're a pair or two females, but I also want to prevent any injuries; it seems like there's a chance for fatal injuries in either case, though... I was also under the impression that juveniles were somewhat communal for their first few months of life or was I misinformed by what I read?

How quick are we talking for growth? I've come across quite a few growth rates, so I don't know what to believe at this point in regards to growth.