Hm, you know, if you want to keep working on the thing for now, as you were, just keep doing it in the manner you originally intended. Whatever you were originally going to put in there. It's not like there's some pre-existing structure to screw up that would mess anything up. At best it'll be just what he was looking for, at worst you have something that just needs to be started over on or reformatted. As it's a separate document it's also not clogging up this thread.
Might be a good idea to copy it all down (like a backup) just in case though.
But yeah, I don't think there's any harm in it at all, so...