Google APP Engine (Standard) Setup

Hi Guys, 

I had v4.04 of CI working on Google APP engine by setting the writable path as /tmp/ on a previous project.

I then created a new project and downloaded a fresh copy of 4.04 and tried the same... but no go. I then grabbed the previous system and application folders and replaced them and there were a few code differences highlighted in Git using Tower and it worked... 

Any idea what's going on here? 

Is there a way to change the writable folders to say a Google Storage Bucket for example? (caching can be done easily via memcache) but the other folders seem to create issues beyond my skill level.