I don't see any reason you couldn't combine it with the antibody since they're two different things. One would bring down the amount of myostatin, and the other would block the rest of it from getting to the muscle cells. Damn, I hope this ace-031 stuff becomes available soon. I'd be curious to know what doses you'd have to take as well.
As for the doses, i forgot that they mentioned them at the graphs on their site.
I suppose 1mg/kg is only minimal and the subjects were not training.
One shot (1mg/kg) means (i guess not always) 1kg (>2 pounds) of muscles in two weeks so it looks pretty good to me. Of course i think it depends on many factors so the final result can be different. Two shots per month + weight training and it should be really interesting.