Started working on some of the smaller details on the locomotive and tender, adding buffers, armour plates for the buffers, boiler hatches, chimney, and driver cab windows.
As a mockup this works pretty well and allows me, using the Flattery plugin, to unfold the outer surfaces and create a mesh that I can print out - initially using a card template to check that the shells will fit the running gear and won't too look out of scale on the track, and then to cut out the main plasticard panels. Smaller details like inspection hatches and armour strips can be drawn in Photoshop and printed out later as they will be flat and simply cut out of thin plasticard and glued into place on the main surfaces. Here's the locomotive main shell flattened out:
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