This model was stitched on 30ct. Putty hand over dyed linen by Wichelt Imports. it uses Weeks Dye Works and Gentle Arts floss, but comes with chart for DMC equivalents. The stitch size is 32 x 59 stitches. If you would do it on 11ct. Aida fabric the size would be 3 inches x 5.4 inches. Hope this helps. It is a cute small project.
I usually add 3 inches per side of fabric for framing, but since this is such a small pattern I think 2 inches per side would be enough.