Addon to save profiles for chat size and positon
 

Its more than likely that this is probably a well known addon or something, but the chat addons Ive use so far have not been able to save the chats actual size and position, just font and backdrop. If there is one I'd be eternally grateful, need it for reflux.

Looking for something like this too! Saw coded in some UI but was not able to export it...
Also woud be great if the addon coud save custom chattabs.

Should be easy to do.

Secure-hook FCF_SetChatWindowFontSize and provide a database where keys are the chatframe IDs, and the values are the font size.

Then, when UPDATE_CHAT_WINDOWS/PLAYER_LOGIN fires, run a "SetFont" on each chatframe.

EDIT: I'm an idiot, I misread OP's question ;)
EDIT2: I know for a fact that you can copy chat-cache.txt and layout-local.txt.
EDIT3: ElvUI sets up chatframes at installation, my unreleased addon Clackity uses a similar approach.