Hi Jake. I was hoping someone with a better grasp of hardware than I have would respond, but since they haven't yet, I'll post what I know and perhaps your post will get a second look.
Aperture is a single-user application. There are some work-arounds that can be effected for multiple-user use, but they will never be more than work-arounds, with the associated in-elegance. Multiple-user image databases exist -- as you can imagine, there is a market for them -- but they are expensive. (Two commonly recommended here are Extensis Portfolio and Canto Cumulus -- search this forum and you'll find threads on sharing an Aperture Library among multiple users.)
The easiest and most robust way to share a Library is to put it on an external drive, and have whoever needs to use the Library use the drive. From a computer and database perspective, this is the same as having only one user, and is as safe and secure as you'll get. Is it possible for you and your coworkers to put the Images you all want to access in one Library on one external drive and share it this way?
Aperture cannot be successfully configured with the Library on anything but locally-mounted drives. WiFi or a wired networked installation is contra-indicated in the User Manual. A more thorough account is here: http://www.apertureexpert.com/tips/2010/8/3/network-drives-nas-and-aperture.html
Note that for simple sharing of files, Finder is a pretty good image file browser, with nicely usable search functions and the ability to display images in a grid and via Quick View.