Share a Hard Drive with Multiple Drives and Users

Background: I have an Airport Extreme (4th Generation) with two external hard drives connected via USB 2.0 and USB hub. I have Airport Utility setup to allow access to both drives via user accounts and passwords. From what I have gathered the way in which the user accounts and passwords work is the Airport Extreme makes two directories at to root level of the hard drive, 'Users' and 'Shared'. All files located in the 'Shared' directory are available to all user accounts setup in Airport Utility. Within the 'Users' directory are sub-directories named for each user account that is setup. All files located within the user directories are available to each respective user.
My trouble is the ability to see both the 'Shared' folders and the respective user folder when I authenticate with a user account. I am able to see the files in the 'Shared' directory on each of the two disks but it seems I am only able to see one of the user account directories and files.
Questions: My two questions are:
1) Is my understanding outlined above correct?
2) How might I be able to see the user directory on both disks as well as the 'Shared' directory on both disks.
I am hoping to still be able to use user accounts to access the disks as I have multiple people who store their files.

It didn't.  After a night of testing, I found that I could get the router to at least let me create shares if I partitioned it as an MBR drive (GPT would not work at all), but it would not even rcognize a partition sized to 2TiB (tebibytes, 2048 GiB) or even one sized to 2TB (terabytes).  The most it would recognize through my trial and error was about 1.5TiB, which I found odd.
This setup would have been too onerous, as it would have made about 746GiB completely unusable on the drive (outside the largest area referenced by an MBR partition table), and I would have had a main partition for files and one that would be invisible to the router (it only read the first partition, obviously).
So luckily, Best Buy took the external hard drive back with no restocking fee (the WD My Book Essentials 3TB is on sale at $150 there if anyone is interested).  I ended up just getting a Synology NAS enclosure and 2 2TB hard drives.  I'll get those on Thursday (hopefully).

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