This link takes you to the display programme map page.
https://wingsoverdallas.org/map/
The image below shows the siting of the pavillions and viewing chalets with the main runway running left to right just out of view across the top of that picture. North is in the 4 o'clock direction.
Based on the comments in the prelim report I suggest the lines would be something like this...
Site layout from the Programme
Estimated displacement from crowd line
The runway centreline as the closest line makes sense and there appears to be a red/white checker building and mast as a good sighting point for the 1000ft line.
Hope that helps