I have completed an article (external link) describing how existing Kinetis Design Studio projects can be imported and used in the MCUXpresso IDE

The following article (external link) shows how to install the Eclipse Market Client into the MCUXpresso IDE

The following article (external link) shows how to genereate S-Records (.s19), Intel Hex (.hex) and Binary (.bin) files:

MCUXpresso IDE: S-Record, Intel Hex and Binary Files | MCU on Eclipse 

Enjoy!

Erich