What we (the developers) generally do for actor sprites is sprite all of the actor parts on a sheet and then use a program that splits the sheet into all of the individual parts and names thme correctly as well as putting them into the correct palette.

So, in a way, there is a "master sheet" you could edit if you have it (it isn't distributed with the game), but it wouldn't be of much use unless if you had or made your own splitting program. I would recommend compiling all of the individual sprites you need to edit into your own sheet however, for the sake of making spriting easier, but you'd have to then manually separate them out, or just edit each sprite individually.

I'll ask if the splitting program can be distributed, as well as our sheets.

Not much happens with CC anymore. Things stopped moving so quickly after a couple years, a little before you started having to buy the game if my memory is correct. I wouldn't expect anything interesting to happen with the game this year.

I'm personally content to sit in general discussion chatting with long time friends on DRL, and finding out about anything interesting that may happen by happenstance.