Michael Shackleton, author of 'The Leopard Trilogy', a mammoth work on all things Leopard, has started a Leopard-oriented website called Leopard Club. It caters to modelers and anyone interested in the broader topic of Leopard FOV and the Leopard User Nations (LUN).
http://www.leopardclub.info/#The fact-files are interesting, for example, the detail provided clearly shows the difference between a Leopard 1A1 and a Leopard 1A2 - something some people seem to get wrong in relation to the trials vehicles tested in Australia in 1972 (they were Leopard 1, Batch 4 production, upgraded to Leopard 1A1 standard, and with a couple of additional fittings unique to the Leopard exported to Canada and Denmark. They were not Leopard 1A2 models).
Mike C