We just need to be able to create all the standard GUI widgets and an OpenGL canvas. What matters the most is that the rest of the team can get it up and running as quickly as possible, but I don't want to just blindly exclude as much from their installations as I think I can get away with and then find out that they are missing some necessary components.

There's simply no way I can believe that it's necessary to fill up that much space with temporary files. But software development is all about running into situations that are impossible to believe...