I hate to put numbers out there, or even ballpark figures because I think it tends to mess with peoples' heads. The bottom line is that everyone has different genetics, and what is possible for one may not be possible for another. With that said, we'd have to also address what degree of dedication are we talking about here?
Obviously we have guys like Lee Priest and Franco Colombu who were 5'4 and 5'5 respectively and weighing in between 185 - 215 lbs, both relied on anabolics to assist them (they also busted their asses in the gym, and had pretty darn good genetics going for them). On the other side of the coin, we have the top Natural bodybuilders who are the same height, but compete at a contest weight of 145-160 lbs.
These are contest weights of course, but if a non-competitive number is what you really need, my friend Steve is only 5'4, and has no plans of competing. While his legs are lacking a bit, he's a pretty big dude and weighs in at about 155 lbs. I figure if he had better legs, he'd easily be 160 most of the year, and then could diet down to about 145 for a show (doesn't sound as impressive compared to the IFBB boys' numbers does it? -lol)