If you read up on the Barry Lyndon lenses, you'll find they were customized quite a bit and actually were in danger of crashing through the film plane, so I don't think they would want to make more of these.
As for <F/1 lenses in general, you can manufacture them but the precision required and the quality of glass make it extremely expensive. Cinema primes of that quality can cost tens of thousands of dollars if they are for sale at all.
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If you read up on the Barry Lyndon lenses, you'll find they were customized quite a bit and actually were in danger of crashing through the film plane, so I don't think they would want to make more of these.
As for <F/1 lenses in general, you can manufacture them but the precision required and the quality of glass make it extremely expensive. Cinema primes of that quality can cost tens of thousands of dollars if they are for sale at all.