Use old street map as Landscape Guide

I want to create a 3d walkthru of the town I grew up in. It no longer exsists so I can’t use google earth etc as a reference map. I have an old street map which I want to use as a reference for drawing roads and placing buildings etc. I was hoping to place this image onto the landscape in a 3rd person view but can’t find a way to do it. Once the roads and building have been placed onto the landscape the image can be removed. I have tried to add the map as a material but that failed. In Unity I can place the image map onto a plane just above the landscape and add components. Hoping to do something similar in Unreal 4.6

You could create your own plane mesh, import it into UE4 or use a BSP and assign your material to it.

But first, why did adding the map as a material failed? What error are you getting? And did importing the texture worked?