Thank you Art V and Alan,
I was hoping to be able to have just independent 2D vector drawings of my viewports so that they can be copied to other files too if necessary. I do get a nice dwg version of my viewports but they are linked to crop layers in the same file so that they can not be copied outside of the file. Which I assume our client will need to do. But I will keep this in mind and prepare the next batch of viewports accordingly.