Hi Handy,
The theory says it is possible to use mqx usb stack to create usb device with cdc and msd, unfortunately we do not have an example to share with you based on MQX.
However, you can find MSD+CDC and HID+Audio+Video composite device examples that you could use as reference on bare-metal Freescale USB Stack v4.1, which can be found on www.freescale.com/medicalusb
Have a nice day!!!
Regards
Soledad