For things like that, they could build special versions of the star ship which remain in orbit as the housing. They would need no flaps, no tiles, just the 6 engines and the fuel tank. The body of the starship itself would be the telescopes tube.
Sure, thats what they did with the JWST. But that ist complex and expensive. A custom Starship could be the cheapest way to get telescopes up to 9m mirror size into space as you can assemble everything on the ground and you don't need a separate housing.
