Rick,
How does Vectorworks handle "paperspace" and DWG? It should adhere to fairly recent specs on DWG so I would use that. I would steer clear of the dxf as it will have less flexibility with the translation process. The frames you're seeing are the viewports exported out (the master layers in PlotMaker speak).
Duplicate the default translator and go through the menu step by step on the copy remnamed to Vectorworks Out.
Plotmaker offers some choices as to how stuff goes out - for example you can put all the views/pmks into model space and the masters as the paperspace - or - squash it all into one.
The translations should be pretty clean as AC has some of the best translators in the business.
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