i played little bit with the three files and was able to move around the objects.

sadly, i didn't get my avatar to appear with changing "MessagingWidgetsSMSConversation" hmtl and js. only got one black rectangle with a border.
it didn't matter if i set the path to image directly or added some lines for "self" setting the missing properties - even tried some code from the ChatConversation.js - nothing.
but i have to say that my coding is rather noobish - never learned js.

mhm... maybe they don't show the avatar in the sms window because they can't *laugh*

if anyone of you gets the own avatar showing up - please describe how you did it. (modding and uploading the file is not permitted according to the files first lines)

one more thing:
in these files there are so many comments like "FIXME" or "request". seems for me that they hadn't enough time to set it up properly...