I take no credit for the basic idea for this project!
When I was working on my Heart Arbor Project, I came across the August 1993 issue of Nutshell News which had one of Joann Swanson's Do-It-Yourself columns. In "Heidi's Grandfather's Chalet" she made the "boulder" stonework for the building & fireplace from foamcore. After using her technique to make the back of Louis' Shamrocks & Shillaghs, I simply decided to adapt it to make a brick foundation for my Willowcrest. So, c
Rather than work with big pieces of foamcore, I just measured the depth, cut a long piece, then measured and marked wherever I needed to cut. Since my Willowcrest was already together, I took this opportunity to take the cellar windows off the house and cut openings in the strips for them. I also made little notches that would butt up against the steps.
Using a metal ruler and the back of the X-Acto knife blade, do the hoizontal score marks. I just eyeballed the spaces, rather than measuring the placement, but it's your choice.