Copying and enhancing natural processes, the scientific community could create enzymics that literally grow structures in the shape and with the properties needed for vehicles, habitation and space fare. Buildings and vehicles grow out of enzymic bulbs, structures can heal themselves, filter water and perform photosynthesis, providing oxygen, power and food.
Mega-cities transformed into green sprawls that act as the new planetary lungs and can become the basis of how to terraform planets.
Enzymics also have the advantage to be able to store exceeding power in carbohydrates.