I'm new to the BBCC system so bear with me.
Is the final entry bracket made up of the "x" number of entries with the highest overall scores, or is it the top "x" entries from each individual voting thread?
I suspect it's the first but it won't hurt to ask.
The final poll is made up of the winners of each individual poll, as well as two wildcards. The wildcards are decided by looking at each poll, and picking the two second-place entrants who came closest by margin of votes to the first place winner.
So, for example, if in Poll A you have Entry 1 with 111 votes, and Entry 2 with 90 votes, but in Poll B you have Entry 1 with 90 votes, and Entry 2 with 89, Entry 2B will move on as a wildcard, as it was closest by vote margin to the winner of its poll than 2A was, even though Poll A received more total number of votes. The difference of course is that we have five polls, and we'll have two overall wildcards instead of just one.
Man I hope that made sense?
wait...can we vote for different people for different topics? I vote Gila Monstrosity for one topic, but could I vote for...say..pokey here?
Of course! You vote for your favourite MOC in each poll.