OS X V10.6 Snow Leopard :: Split One Monitor Into Two, Differently Configured Desktops

I have a 27" iMac. I would like to split the screen into two differently configured desktops or monitors. Apps like TwoUp or Divy don't exactly do this. I'll explain it with an example: 

Suppose I'm working on a document and I need to open many folders to retrieve files. One common problem is that opened folders overlap each other and sometimes they overlap with the document I'm working on, or they go underneath the document. I would like to split the screen vertically in, say, two virtual, independent desktops/monitors, like this:

- one window/space on one side (say, on the left) of the screen would contain the document  from top to bottom, with no dock bar on the bottom

- the other window/space (right) would behave as a regular, full desktop, with the entire dock on the bottom 

In this way, if I need to navigate to find a file to use in the document, I would move the cursor to the right. The Finder would work only in this window/space, thus windows or other applications would never overlap or clutter the left side of the screen. Drag-and-drop from right to left should be possible. 

One way to imagine it is as if the 16x9 monitor were comprised by two vertical, 8x9 independent monitors side by side, each with its own configuration.