Please always take a look at Changelog Section. I will post there my newest work for next update and always when I know an release date I will post it there as you can see.
Sure, I wasn't aware of the changelog, I will bookmark it right away!!!...
Your system partition is small
In your case maybe it's better to install only the core apps (don't select any any app from list)..and download the other apps from play store
Or use the Zero package from SlimLP GApps..it only contains the core ...
If you're installing 10.1.RC3, then that's android 4.2.2. From that you should be able to tell yourself which gapps you need ;)
On the install screen after the rom has been flashed, yes there is a list of languages available. I can't guarantee 1...