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https://www.cad-modelltechnik-jung.de/construction-plans-model-engines.html
That link should get you to the English language page. Radial plans from 3 to 9 cylinders.
You could anodise the Al bush to form a hard surface layer.
Matt, any electroplating business should be able to supply you with zinc billets at a reasonable price, specifically those that sell DIY plating kits.