Yes, I can see what you mean.
If Stephen wishes to make the mics again I'd be ecstatic, but I think that it is a tough business and probably costly and timeconsuming too. I think that, as Neil has said , there is a possibility to mould them out of resin which is great, but if you want to make the most accurate repro possible the best material to use is metal (especially if it undergoes as much abuse as you say).
What type of metal are the mics made from? I'd imagine it's expensive and tough to work with too.