EDIT: Latest update post.
This is confusing me a bit.
What do you mean reverse engineered? If you mean getting the script from it, then that was done with Rewrite. The tools don’t work on Holy Breaker or Angel Beats though. I was thinking about getting in contact with the Russian TL group of HB, but that sounds like work… x.x
Oh, and Siglus doesn’t use SEEN files, it uses a .pck, that contains a bunch of .ss files and .txt files. All the stuff you’d need for translation is in the .txt files.
Oh, and aside from wordwrap issues that can be easily fixed, I don’t know of any text rendering issues.