Not sure why you'd want to put cottered cranks on that frame, but if you insist, there is info on axle lengths here: http://www.classiclightweights.co.uk/bblengths.html
TDC axles are relatively easy to come by, but presumably you'd have to match the axle with Italian threaded BB cups.
As for the paintjob, presumably if you take it to a professional resprayer he/she should be able to save your chrome.
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Not sure why you'd want to put cottered cranks on that frame, but if you insist, there is info on axle lengths here: http://www.classiclightweights.co.uk/bblengths.html
TDC axles are relatively easy to come by, but presumably you'd have to match the axle with Italian threaded BB cups.
As for the paintjob, presumably if you take it to a professional resprayer he/she should be able to save your chrome.