there's plenty of boosted old datsuns, it can be done.
Get your prototype done, get busy testing it.
Making a market for parts for a car that most people consider to be disposable is hard. But look at datsun 510 land. Biggest problem is that many people who have cars made after 1976 can't legally add turbos, or anything else that increases performance.
I've taken such a beating on my lpg conversion, having to go to nevada to register it. But I'm not backing down, the state here is wrong.
you need the prototype, then dyno it and figure out what improvements it needs, if any.