Hi yes thats cool. i've been very lucky this weekend and only glad to share information. i have looked and the content isn't available yet but it will launch 2nd october i presume.
For the B grade for the first Helena. it was about 140 000 I think we got a 70 combo or there abouts.It was on duo so those scores posted above seem to be correct. Then you can use Helena for any map, and getting an S Grade with her following his scores above unlocks her police uniform

Albert i can't see anyway to change the weapon layouts, so far I have the three main characters, helena , and the unlockable outfit for those 4.
I don't know how yet to unlock Sherry or Piers or if theres anyone else as i've not had time to watch all the videos popping up! But I was told by another player who was no.1 on the score board that Ada, and 2 other maps I havent yet unlocked are done by doing the campaigns. I don't know how to unlock the old school ps1 style skins either. Anyway cheers I will let you know if find anything else good.