Hi @ivanpicchi,
There is already a Contour Profiler available in the Fit model report. You can access it in the red triangle, "Factor Profiling", and then "Contour Profiler". There are multiple options available, like setting high and/or low limits for each response to help coloring the excluded area, or setting Contour grid :
If you are interested about visualizing each pair of factors and visualizing the accessible area, you can click in the red triangle of the Contour Profiler on "Multiple Contour Frame" and select all your factors. You'll then be able to visualize the accessible/optimal area for each pair of factors :
Hope this answer will help you,
Victor GUILLER
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)