Hi Charlie,
Looking back at your orginal post I detected that those were the projects in your explorer.
== > How did you import them ?
- If you followed the user guide and import the project from SDK, you shall have only 'Hellow World' project visible.
- From the screenshot I assume you import the files refering to SDK folder.
The Out of Box Demo files will be removed from the SDK as they are available from the Studio in a few days.
The Rapid IoT Studio service is unavailable for a couple of hours right now, but has soon as it get back live I advice doing the following:
- Delete the 3 projects and file from your work environment
- Compile Out Of Box application and download files (Hammer and arrow in box icons)

- Unzip the files clode to the root (c:\temps\OOB for example)
- Import this folder (from file system) in MCUXpresso.


- Make sure you untick 'Copy projects into workspace'

As you will see there is now only 1 project to build (Rapid_IoT based is integrated)
Build will then be successful:

If still not working, I propose to have a private conversation and a skype screen sharing session so we can check why the problem would persist on your side.