John, when I used a cookie cutter, I laid out my track where I want it and mark the plywood at least a half inch beyond the ties so you know where to cut. I then removed the track and cut the plywood. I then fastened the cut plywood to the risers and cut out the Homasote to match. A variation could be to mark the Homasote with the cut plywood pieces before fastening to the risers. Just make sure you overlap the joints so you don’t have the edges of the plywood and Homasote at the same spot. Is the foam intended for a scenery base?
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