After a bit of googling for source material, I had something to go on...
I printed out an enlarged OS map of the contours for Helvellyn, scaled to fit on one of my 12" square hardboard terrain bases. Boy 2 then carefully traced each contour line, making sure each one was a complete circuit (it gets a bit tricky under the wording on the map). Then I followed my previous procedure for transferring the contours onto styrofoam. Draw round the outermost contour, then carefully cut it off; draw round the next contour, then carefully cut it off; etc, etc.
Below you can see the completed contours 1 and 2 (there are going to be 11 in total on this one!) - which introduced another problem. My styrofoam is 1" thick (25mm). If I were to make each contour 1" thick, the whole thing would be 11" high. For a 12" square base, this would be a rather ridiculous vertical stretch. I couldn't be bothered with doing the maths to get the correct thickness of contours for the base size I'm using, so in the end I just decided to saw each styrofoam block thickness in half (not an easy job to keep it straight with a handsaw) to give each contour a thickness of approx 10-12mm (I did wobble somewhat). The whole thing should now be only 5 and a half inches high when finished, which is a lot better, but still too high. However, this is a primary school project, not a to-scale model of the whole lake district... hmmmm.... a to-scale model of the whole lake district.... now there's an idea..... :-)
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