First, I would like to ask you if you checked with the Emacs developers about
including your work directly in the Emacs repository.
No, I didn't ask the Emacs developers about it, but I could in the future.
It will take some time getting to par with the original text, but once there's a full translation, it would be great to have Emacs distributed with translated manuals.
Copyright for work done on Emacs is usually transfered to the FSF. Did you do
so?
Are you sure your project needs to patch Emacs? Maybe you should discuss with
the Texinfo developers to see how you can best install this translation
alongside the original manual :)
No, I'm sure there's a different scheme for installing several versions of the Info files. It's just that I haven't investigated it. Too busy with the translation :)