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Took me awhile to find it but Yes, the flip side of a roll of veneer you'll find in a hardware shop. The glue on the reverse goes on in a diamond pattern, similar to walkways, so if you paint the veneer grey, and run some pencil dust over the ribs it will look like patterened metal and hopefully pass the two foot rule. Etched brass though, from weshty et al, would be better.
But, I was out in IKEA at the weekend - gotta pay for Raheny at some point - they have these brush and pan sets, 2.50 each. For the cheapest source of straight thin plastic, purchase one, grab a Stanley, cut the brushes off. Several thousand scale pipes for hundreds of uses. Also, avonmore milk produce a pint of milk in a styrene type container. Drink milk, rinse, and cut to size to replace that missing roof from the hornby weetabix wagon etc. Same curve. Add brush bristles that you made earlier, to create roof banding, for added detail. Will post this on my WB tomorrow.
Must be off. Yard brushes to be investigated for goodness...