It's here--Version 2.0 of my Rectangle Maker! Type in your length and width to draw a rectangle! Click the orange button to hide the cat. Click the blue button to show the cat.
Like in my Square Maker, I used a custom block. View that project: https://scratch.mit.edu/projects/168998651/ (Aren't custom blocks pretty dang cool?) Update: Demonstration at the beginning removed to make way for the new coding.