Dai,
Greetings and welcome.
My suggestion is, in the absence of any others, maybe contact the Llangollen, Railway and see what they do. Thet might know someone you coukd speak to.
Another might be Messers Fox Transfers (Leicester area) who produce various transfers for railway modellers ans might be able scale something up or, at least offer advice.
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May the force of nature be with you, not against you!
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