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Aluminium Warehouse will do 5mm 6082 sheet cut to size 100mm min dimension , but shipping is £12 / order IIRC ... Hope this link works:http://www.aluminiumwarehouse.co.uk/cutting_calc.phpDaveNo, it didn't. Does not keep the options I did ... just goes to input screen. 130 x 130 x 5 was £1.33 ex vat.
If you can attach the plate to the rotab with backing, why not mill the OD and the center bore rather than using the lathe at all?
Cheaper than a decent end mill
Depends on who your supplier is...