Controlling Universal Access Zoom from Applescript

I frequently use my iPad to remote control my Mac Pro, and have a need to select a window, move it to the upper left corner of the display, re-size it to match the aspect ration of the window, and then zoom in (Ctrl+Scroll with mouse) to a specific zoom level. I have the script working for resizing and repositioning, but I can’t seem to figure out what object I should be working with to control the zoom. Any help would be appreciated.