The Zoo Flak Tower is rather unhelpfully described as being 'as tall as a 13-story building' in all the quick references I could find. And a story is conventionally measured as 10 feet. So: 130 X 12" = 1560". Divide by either 30 or 32. By 30 is the easiest, and gives a height of 52 inches.
The tower complex is about 230' per side, or 92 inches a side in 1/30.
Good luck!