Whoa, a flashback! Many, many years ago I worked on online presentation software that dynamically assembled Flash clips from clip-arts / user-provided graphics and text. There was a lot of parsing and reassembling of SWF involved. There used to be Swfmill library, but it didn't have enough stuff in it to deal with animations / transformations. Sigh that was a fun project.

My approach at the time was to have Org-mode tables detailing the meaning and composition of chunks of binary data. That wasn't nearly as comfortable as this editor seems to be, but I was told that it looked very impressive to people looking over my shoulder. Just like in those "hackers movies" where the screen is filled with gibberish sequences of digits and other random characters :)