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doubleodavey
Even in stainless, 0.75mm is bloody thin for something you'll be trying to press fit into the headtube. And 0.05mm is what I'd consider a loose sliding fit rather than a clearance tolerance. The only way I can see it working well is to make the headset cups totally external and then either bond, braze or weld them to the outside of the headtube. With your design I'd classify the headset cups more as bushings than bearing retainers. Mind you, I've always wondered why headsets don't use bushings rather than bearings. An Igus bushing would be fine for that purpose I'd have thought.