There are a handful of sketches drawn on whatever paper was handy.
This one (and last week's) were on the back of a page from a pad of office routing slips, which were much bigger than the original pads that I doodled on, but smaller than the booklets.

I don't remember when exactly I started plotting the stories out in advance so I would have some idea whether or not they would fit on the page.

Comics shown are # 56, and # 57.