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Sourcing in the profile does not solve all the problems. GUI apps, for instance, do not read-in modifcations to PATH from /etc/paths.d/ the way Terminal does. I think there might be some other environment variable issues too, but I haven't been able to nail them down yet. Still, I'll look into iTerm2 and see how much closer that gets me to where I need to be.
A warning for those trying to follow these instructions: You must be running El Capitan (or, presumably, higher once Sierra comes out) in order for them to work. If you're running a Yosemite host (as I am) then these instructions (suitably modified) will work to create a Mavericks or Yosemite boot disk, but you cannot use them to create a working El Capitan boot disk (the VM will hang during the boot process and never get to the installer). Also, the created iso can't be used to upgrade a Yosemite VM (you'll get an error message when you try). For that, you need to use the App Store.
