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For what it's worth, when I make any critical cuts on a styrene piece that I'd rather not mess up, I have a small steel rule that I glued sandpaper to the back of. I very carefully place this right where I want to make the cut then clamp it in place with two (or more) small C-clamps. The sandpaper keeps the rule from slipping once the clamps are tightened. That way, I can take the back edge of an X-acto knife & gently scribe the cut many times with very light strokes & pressure. Eventually, I'll cut through the piece. If you are really lucky, you can make the cut in a scribe line for vertical wood siding or along an outside rib. In that case, the joint becomes very hard to find. Anyway, it works for me; your results may vary. dlm (Dan Merkel)