it's my first question over here. I'm wondering if I could use more than one USB Gadget like in that Tutorial just that I use g_ether and the mass storage. Thanks in advance!
watch out about compatibility of raspberry pi zero and usb hubs that seems not simply to be related to the hub being a powered one but specifically on chipset compatibility like many users are reporting.
have a look at this list that has been created so far: http://elinux.org/RPi_Powered_USB_Hubs even though only one at the top seems to be specific for the zero.