Theres already 1:4 seed to peer ratio for main pack. Next week, when everything will calm down it should download in less then an hour. It's about 6GB archive. Patches were abandoned about two years ago when modular models became widespread. Sources are modular while endfiles are compiled into one and there isn't any metafile to tell generator that some part was edited and it should reexport whole model, so many fixes wouldn't aplly in such form.
Developers have acces to source files but they are three times as massive, loads much longer and gives lower performance overall. With knowledge of game structure it's possible to pick new files one by one from subversion snapshot and mix them with compiled version, filling sources for all missing dependancies with errors list. But that's a way for overly eager fans to show up with new vehicle on social media, rather then keeping up to date version.