Just Create a back view! Example: Get into the 4 view mode. Select the top view (RMB in top pane). In its menu bar select Panels > Perspective > New. Now in this new perspective view just Rotate the window to see the back of the image. You will have to square this up to the best of your ability. Once alligned I would save this view for future modeling. Remember not to Rotate this Panel. There it is a Back view. The window will say Persp 1 but if needed I think that can be changed. You might notice a camera form in the original perspective view.