A feature that would be good to have is if a "Internet in a Box" could also store the update files for serving to other "internet in Box" machines.
( However having worked as a technical software tester in similar systems for over 20 years , its probably to complex to implement reliably, being able to handle all the edge cases. Is my GUESS )
For small pieces of content, doable through the IIAB implementation of usb_lib and upload2usb. Content is also easily available to client machines that are connecting to the IIAB.
For less ephemeral learning bouquets (i.e., curated content), an implementor can customize their IIAB their specific content and then image/clone as needed.
( However having worked as a technical software tester in similar systems for over 20 years , its probably to complex to implement reliably, being able to handle all the edge cases. Is my GUESS )