Here is the download link to a sketched plan of Strabane town which dates back to 1799. This file is in KMZ format and can be opened and explored in Google Earth.
Sketch plan of Strabane to illustrate proposed layout of new streets and houses 1799.
A word of caution: Google Earth should not be expected to give measurements to any dependable degree of accuracy.
Architect: Robert Woodgate
1790 General Map of Ireland