I worked on my Doc Schnibbles this weekend as well, and can't wait to finish it up and get it on my table. You may notice that I have made a smaller version than the pattern, using only four squares.
What I found out after getting the four blocks and lattices together is that the plan to use four inch half square triangles for the outer border, as shown in the nine block pattern version, won't work. The measurements are off when I try to use the larger half square triangles with my four block topper.
No matter. The four blocks plus lattice measured 24 1/2", so I made 2 1/2 inch half square triangles. When I sewed 12 of them together, the strip measured 24 1/2", which was "just right" as Goldilocks said. I kinda like the look of the smaller hsts anyway.