I found the gel medium not enough to size the raw canvas. So I went back to diluting the clear gesso and doing two layers on the raw, instead a thicker, streaky layer as I tried before on the cradle panel. The diluted layers are working well. I also printed out some smaller ratio rectangular frames of my work surface for thumbnails.
My next project will be on zucchini blooms. I have them in the garden and they are quite beautiful.