The foamboard structure slides in and out of the Snackbox. This should make it simple to work on from all sides during construction, and will make it easier to take photos from tricky angles when the layout is complete.
The simple bracing, which strictly speaking I could probably have done without, given the thickness and small dimensions. The entire foamboard structure weighs in at 250 grams.
The 10mm board seen next to a 5mm example and showing the sandwich structure of this material. The idea of using foamboard for lightweight baseboard construction is of course quite well tested by now, eg on Chris Nevard's superb Catcott Burtle. There was also Keith Harcourt's Kappaboard layout (see e.g. Railway Modeller January 2000) which even made do without the plywood shell.
So far I have used my X-acto knife as the main means of cutting the foamboard, although I hear that a scalpel may be better. With the thickness used here I do occasionally have problems keeping the end profiles exactly at 90 degrees. Checking the web I found these specialist foamboard cutting tools that look tempting but also rather expensive, so I think I'll keep at it and learn it the old-fashioned way.
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